1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
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>

You might be interested in
Why is atp an example of chemical potential energy?
marta [7]
Hello! I hope this helps

Answer: ATP ( adenosine triphosphate) is considered as the energy currency of the cell as it stores energy in the cell. It is an example of chemical potential energy because energy is stored in the high energy containing phosphoanhydride bond (between phosphate molecules in the ATP).
7 0
3 years ago
Describe the reactions role in earths natural processes?
Inessa [10]

Answer:

energy flow and nutrient cycles ( photosynthesis , food webs, decomposition webs) sediment transport and soil formation. the water cycle. reproduction/ regeneration mechanisms.

4 0
3 years ago
Match each of the following topical dosage forms with its correct definition.
Dmitry [639]

Answer:

cream - contains a higher proportion of oil than water

ointment - dr4g mixed in approximately equal proportions of oil and water

i don't know about the other two sorry

8 0
1 year ago
What type of bond would you expect in a compound of oxygen &amp; sodium?
Aleks04 [339]
4Na+O2--›2Na2O
Ionic bond
5 0
3 years ago
At STP, a 50.-gram sample of H2O(l) and a 100.-gram sample of H2O(1) have
LiRa [457]

Answer:

The same chemical properties

Explanation:

Different masses of water at the same temp and pressure will have different volumes and the same empirical formulas and the same chemical properties

6 0
3 years ago
Other questions:
  • Carbonic anhydrase is a zinc-based enzyme that catalyzes the conversion of carbon dioxide to carbonic acid. In an experiment to
    12·1 answer
  • Cobalt-59 is a stable isotope and cobalt-60 is an unstable or radioactive isotope. These two isotopes differ in the number of -
    5·1 answer
  • Primaries, the secret ballot, and the use of
    7·1 answer
  • What is the molarity of 245.0g of h2so4 dissolved in 350ml of solution​
    15·1 answer
  • why is it easier for water to flow through rock and sediment with larger pores than through rock and sediment with smaller pores
    9·2 answers
  • How do we turn petroleum into energy we use?
    13·1 answer
  • 11. Is this compound an acid or a base: H20?<br> both<br> base<br> neutral<br> acid
    6·2 answers
  • What are the three ways that an object can interact with a static field?
    14·1 answer
  • - How many moles of S2 are needed to produce 1.50 moles of SO2 gas? S2 + 20, ----&gt; 2802​
    7·1 answer
  • At stp,250cm3 of gas had a mass of 0.36g.what result does this give for the molar mass of the gas​
    12·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!