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labwork [276]
3 years ago
13

How many valence electrons does a helium atom have? what is the formula of the ion formed when potassium achieves noble-gas elec

tron configuration?
Chemistry
1 answer:
OlgaM077 [116]3 years ago
3 0

> How many valence electrons does a helium atom have?

The electron configuration of Helium is simply 1s2. We see that its outermost shell is the s shell and it contains 2 electrons, therefore the number of valence electrons is also 2.

 

> What is the formula of the ion formed when potassium achieves noble-gas electron configuration?

Potassium has a electron configuration of [Ar] 4s1. To have an electron configuration of only [Ar] which is a noble gas, the one electron from 4s1 should be removed, hence:

<span>K+</span>

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The gravitational force between which two objects would be the most difficult to notice? A. The moon and the earth b. The moon a
Ghella [55]

Answer:

d. A water particle and an air particle

Explanation:

The force of gravity (F) between two objects of masses m1 and m2 and separated by a distance r is given as:

F = G\frac{m1*m2}{r^{2} }

where G is the gravitational constant

This force is therefore, directly proportional to the masses and inversely related to the distance between them.

Based on the given options, since the masses of the water and air particles are very small (masses of earth, moon and sun is relatively huge), the gravitational force between them would be negligible and difficult to measure.

5 0
3 years ago
How are solubility and temperature generally related in a system consisting of a solid solute and a liquid solvent?
Nesterboy [21]

Solubility and temperatures are directly related. The higher the temperature of the solvent, the higher the solubility of the solute in the solvent.

Dissolving a solute in a solvent is an endothermic process hence providing heat favors the  process. Higher temperatures cause the molecules of the solvent to have high kinetic energy hence bombard each other and with that of the solute with high frequency. This then ensures fast diffusion of the solute particles in the solvent.


8 0
3 years ago
Asteroids, comets, and meteors are generally lager than a planet<br><br> True or False
OLEGan [10]

Correction *

this is false

8 0
3 years ago
Read 2 more answers
Which property altered during a chemical change is not altered during a physical change?
marissa [1.9K]
<h3>During physical changes, the composition od the original substance is not altered, but the properties of the original substance are altered. During a chemical change the composition od the original substance is not altered and the change is irreversible. Melting of butter and wax is an example of chemical changes.</h3>
7 0
2 years ago
Read 2 more answers
What is Δn for the following equation in relating Kc to Kp?<br> 2 SO2(g) + O2(g) ⇌ 2 SO3(g)
swat32

Answer:

Δ N = -1

Explanation:

Step 1: Data given

2 SO2(g) + O2(g) ⇌ 2 SO3(g)

For 2 moles of SO2 we need 1 mol of O2 to produce 2 moles of SO3

Step 2: Calculate Δ

Δ N  wNill be the sum of moles of products minus the sum of moles of reactants.

Number of moles of products = number of moles of SO3 = 2

Number of moles of reactants = number of moles of SO2 + number of moles of O2 = 2 + 1 = 3

Δ N = 2 - 3 = -1

4 0
3 years ago
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