Using the choices below, which is the complete symbol for the isotope that has the following subatomic particles: 19 protons, 21 neutrons, and 18 electrons.

(A: 40 19 K -1)
(B: 40 21 Sc +1)
(C: 38 19 K +1)
(D: 40 19 K +1)
(E: 39 18 Ar +1)

a. A
b. B
c. C
d. D
e. E​

Explanation:

this is the balanced equation

Answer:

Orange

Explanation:

I used google my b

Answer:

ORANGE

explanation:

Small pieces of sodium burn in air with often little more than an orange glow. Using larger amounts of sodium or burning it in oxygen gives a strong orange flame.

Answer:

B

Explanation:

Answer:

information about elevation and slope

Explanation:

.

Answer: Carbon-12 and Carbon-14 both have the atomic number of 6.

Explanation: They are both isotopes of one another. This means they have different amount of neutrons, resulting in different atomic masses.

Answer:

They have the same atomic number.  Carbon has the atomic number of 6 which means that all isotopes have the same proton number. However, the number of neutrons is different, thus giving different mass numbers.

Explanation:

If the normal melting point of a substance is below room temperature, the substance is a liquid at room temperature.

If both the normal melting point and the normal boiling point are above room temperature, the substance is a solid.

Answer:

An ion with 11 protons, 11 neutrons, and 10 electrons would have a charge of 1+, also expressed as a charge of positive one or +1.

Answer:

reversible redox reaction

Explanation:

Answer:

easier and pollution

Explanation:

I just had this question and got it right

Answer:

C

Explanation:

Answer:

C

Explanation:

Balanced equations have the same number of atoms of each element on both sides of the equation (right and left side of the arrow).

First count the number of atoms of each element of the original equation.

CO(g) + O₂(g) ⟶ CO₂(g)

RHS: 1C, 3O

LHS: 1C, 2O

Balancing the O atoms,

2CO(g) + O₂(g) ⟶ 2CO₂(g)

LHS: 2C, 4O

RHS: 2C, 4O

Thus, the equation is balanced.

*General rule: balance O and H atoms last (in this case C atoms were initially balanced)

LHS= left- hand side

RHS= right- hand side

A) Incorrect as there are 3 O atoms on the LHS and only 2 O atoms on the RHS.

B) Incorrect as there is 1 C atom on the LHS and 2 C atoms on the RHS. Also, on the LHS there is 3 O atoms while there is 4 O atoms on the RHS.

D) Incorrect.

LHS: 2C, 6O

RHS: 2C, 4O

Answer: OB. Secondary Sectors.

Explanation: Make sure to study as the text provided, and study guide state manufacturers, butchers, and factory employees are apart of the secondary sector in the world economy. You’ll do great on Quiz 3.2.5! Make sure to study, have a g’day. Please don’t listen to people who say this answer is falsen as many other questions do, don’t be the one to spread false information as this people’s academics, here’s a picture as well ❤︎. Again, its B!

Answer:

8x8 Inc. is a provider of Voice over IP products. 8x8 products include cloud-based voice, contact center, video, mobile and unified communications for businesses.

Explanation:

Answer:

Some of the physical and chemical properties of magnesium are:

-The term ‘magnesium’ is derived from the Greek word magnesia, which refers to the name of the place from where it was extracted.

-Magnesium is closely related to manganese and magnetite.

-About 2.1% of the Earth’s crust contains magnesium. This makes magnesium the 6th most found element.

-The biggest deposits of magnesium is found in the seawater. It has been calculated by scientists that a cubic mile of seawater contains about 6 million tons of this element

2nd answer:

Physical Properties of Magnesium: ”I’m a highly stable element, so you can count on me”

Chemical Properties of Magnesium: ”I love to travel but I do corrode aluminum so we won’t be flying off on adventures in airplanes planes anytime soon

Explanation:

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Answer:

40.0 mL. (4 marks)...

Explanation:

Answer:

2+

Explanation:

An oxide ion is diatomic

Answer:

57 minutes and 35 seconds, or 56.95

Explanation:

Answer:

56.95 minutes

Explanation:

hope it helps

Answer:

Explanation:

The acceleration of an object given it's mass and the force acting on it can be found by using the formula

[tex]a = \frac{f}{m} \\ [/tex]

f is the force

m is the mass

From the question we have

[tex]a = \frac{6000}{800} = \frac{60}{8} = \frac{15}{2} \\ [/tex]

We have the final answer as

Hope this helps you

Answer:

1.Liquids have less force of attraction between molecules than solids and more than gases; gases have a very weak force of attraction between the molecules which is the least amongst the three states of matter. 2.Liquids have definite volume; gases do not have definite volume.

Explanation:

:) HOPE THIS HELPS

Answer:

particles

Explanation:

particles are buzzing around very quickly when in a gas, but when in a liquid they vibrate.

Answer:

The Key difference between average vs weighted average is that simple average is nothing but simply adding up all the observation values and dividing the same by the total number of observations to calculate the average whereas weighted average is an average where each observation value will have a frequency assigned.

Explanation:

The weighted average involve the frequency of scores while the non-weighted average do not include the frequency of scores.

To calculate a  non-weighted  average such as a mean average, all we need to do is to sum up the scores and divide this sum by the number of scores. For a weighted average, each score must have a frequency attached to it. This frequency is called specific weight.

While the non-weighted  average such as a mean average is a measure of central tendency, the weighted average tends to be biased towards the scores that have the largest frequency.

Learn more:https://brainly.com/question/14283892

The density of the wood : 1.45 g/cm³

Density is a quantity derived from the mass and volume  

Density is the ratio of mass per unit volume  

With the same mass, the volume of objects that have a high density will be smaller than objects with a smaller type of density  

The unit of density can be expressed in g/cm³ or kg/m³  

Density formula:  

[tex]\large {\boxed {\bold {\rho ~ = ~ \frac {m} {V}}}}[/tex]

ρ = density  

m = mass  

v = volume  

[tex]\tt V=2.7\times 5.5\times 3.9=57.915~cm^3[/tex]

[tex]\tt \rho=\dfrac{m}{V}\\\\\rho=\dfrac{84~g}{57.915~cm^3}=\boxed{\bold{1.45`g/cm^3}}[/tex]

Answer: In science, a model is a representation of an idea, an object or even a process or a system that is used to describe and explain phenomena that cannot be experienced directly. Models are central to what scientists do, both in their research as well as when communicating their explanations.

(hope this helps you ^^)

Answer:

-229.27°

Explanation:

(128K − 273.15) × 9/5 + 32 = -229.3°F

Answer:

number of valence electrons

Explanation:

elements in the same group has same number of valence electrons

Answer:

The correct option is;

Determine the density of the object and compare the known density of pure Silver

Explanation:

The density of the object is found by finding the weight of the object, and then finding the volume (of water) the object displaces when it is immersed (in water)

The  density is then fond by dividing the weighed mass by the volume the object displaces when immersed

Compare the result of the measured density with that of pure silver. If the two have density, as well as other similar physical characteristics, then the object is likely to be pure silver.

Answer:

Hi

Explanation:

How has your brainly experience been so far? Are you liking?

Answer:

Thx you are sooo noice

Explanation:

UwU U3U

Answer:

Liquids take the shape of their container, they are one of the three stages in between a solid and a gas. A liquids particles are not in a fixed position like a solids, nor do they move as freely as a gas.

Answer:17 protons

Explanation:

An element with 17 protons will always be chlorine. However an element's mass numbers can vary, which means that it can have different numbers of neutrons. So although chlorine has a mass number of 35 which means it has 18 neutrons, it can also have a mass number of 37, which means it has 20 neutrons.

Answer:

Explanation:

The mass of a substance when given the density and volume can be found by using the formula

From the question

volume = 7 mL

density = 17.5 g/mL

We have

mass = 17.5 × 7

We have the final answer as

Hope this helps you

Answer:

Grams

Explanation:

The mass of a penny is closer to the mass of a grape than to the mass of a book. So, use grams to measure the mass of a penny.