4 years ago

The element calcium forms the ion Ca2+. How many protons, Neutrons, and electrons does it have?

Chemistry

1 answer:

KonstantinChe [14]4 years ago

4 0

Answer:

18 electrons

20 neutrons

20 protons

Explanation:

You might be interested in

Select the correct answer. Thomas has 235 grams of K2S in the chemistry lab. How many atoms of potassium (K) are in 235 grams of

Readme [11.4K]

Atoms are the smallest division of the element. The potassium atoms present in the 235 gm of the compound is $2.57 \times 10^{24}$ atoms.

<h3>What is the number of atoms?</h3>

Given,

Mass (m) of Potassium sulfide $(\rm K_{2}S)$ = 235 gm
Molar mass (M) of Potassium sulfide = 110.26 g/mol

Calculate the number of moles as:

$\begin{aligned}\rm Moles (n) &= \dfrac{\rm mass}{\rm molar\;\rm mass}\\\\&= \dfrac{235}{110.26}\\\\&=2.13\;\rm mol\end{aligned}$

In the given compound $\rm K_{2}S$ , there are two atoms of potassium and one atom of sulphur.

If, 1 mole = $2 \times 6.022 \times 10^{23}$ atoms of potassium

Then, 2.13 moles = X atoms

Solving for X:

$2.13 \times 2 \times 6.022 \times 10^{23} = 2.57 \times 10^{24}$

Therefore, option c. $2.57 \times 10^{24}$ is correct.

Learn more about atoms here:

brainly.com/question/11411852

6 0

3 years ago

An object exerts force of 500 n and sits on an area of 4.5m X 1.5m. Calculate the amount of pressure exerted by the object in to

vlabodo [156]

4.5 times 1.5

divide by 500n

5 0

3 years ago

The density of water is 1.00 g/mL. If your swimming pool holds 208,000 gallons of water, what is the weight of the water in a fi

Natasha2012 [34]

Answer:

12.455≈12.5 tons

Explanation:

1 US gallon of water (gal) = 8.35 pounds of water (lb wt.)

so we divide 208,000 by 8.35 to covert to pounds

then divide the pounds by 2000 to convert to tons.

8 0

3 years ago

Which of the following should be classified as a mixture? water air iron helium

Evgesh-ka [11]

Air is a mixture because it is made up of many constituents like oxygen, argon etc. it can be physically separated by fractional distillation. it doesnt have a formula unlike compounds and elements. its composition varies differently with its constituents.

5 0

3 years ago

Read 2 more answers

What kind of changes are permanent and alter the identity of a substance

siniylev [52]

Chemical changes are permanent and alter the identity of a sustance

5 0

4 years ago

Read 2 more answers