Question

Q5:- The given figure depicts the atomic structure of an atom of an element 'X'. Write the following information about the element 'X'.(5)

8p 10 n

(a) Atomic number of 'X'

(b) Atomic mass of 'X'

(c) Valence electrons

(d) Valency of 'X'

(e) 'X' should be metal or non-metal.​

Answer 1

1. Atomic number = Number of protons = 8
2. Atomic mass = Number of protons + Number of neutrons = 8 + 10 = 18 u
3. Valence electrons = 6
4. Valency of ‘X’ = 8 - 6 = 2
5. ‘X’ should be non-metal because there are six valence electrons hence it will take two more electrons to complete its outermost shell.

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Answer 2

Answer:

Atomic number = Number of protons = 8. Atomic mass = Number of protons + Number of neutrons = 8 + 10 = 18 u. Valence electrons = 6. Valency of 'X' = 8 - 6 = 2.