How many valance electrons are present in element with atomic number 18 ?
Answers
Answered by
1
Answer:
8 electrons
Answer. The element having atomic element 18 is Argon. Its Electronic Configuration is 2,8,8. So it's valence shell will have 8 electrons.
Explanation:
Answered by
3
Answer: 0 electrons.
Explanation:
According to Bohr's model of an atom;
- K shell can hold up to 2 electrons
- L shell can hold up to 8 electrons
- M shell can hold up to 8 electrons
- N shell can hold up to 8 electrons.
Note: This rule can be applicable till 20th element that is Calcium.
In the given question,
The atom has atomic number of 18
∴ It's Electronic Configuration → 2, 8, 8
Here, the M shell is completely filled.
So its valency is 0.
The elements which has 0 electrons are known as 'Noble Gases'
They are called so because They do not react with any metals or non metals or other substance present in the periodic table since their outermost shell is completely filled.
Other examples of noble gases are Helium, Argon, etc.
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