Question

The periodic table given below consists of elements with atomic numbers from 3 to 18. Some of the
elements are shown by letters but the letters are not the usual symbols of the elements. 3M
Atomic Number 3 4 5 6 7 8 9 10
Element
LATBLIC
Atomic Number 11 12 13 14 15 16 17 18
Element
TEIG
i) Write the electronic configuration of two elements which have similar chemical properties.
ii) Which of these is a
a) metalloid
b) noble gas?
iii) Out of A and C. Which one has greater atomic radius? Give reason.

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Answer 1

Below are given the answers to the questions.

Explanation:

Atomic number

3 4 5 6 7 8 9 10

The atomic number belong to

Lithium "Li" = 3

Beryllium "Be" = 4

Boron "B" = 5

Carbon "C" = 6

Nitrogen "N" = 7

Oxygen "O" = 8

Fluorine "F" = 9

Neon "Ne" = 10

i) Write the electronic configuration of two elements which have similar chemical properties.

Sodium "Na" and Potassium "K" have similar chemical properties.

Their electronic configuration is

Na (11) = 1s^2, s2^2, 2p^6 , 3s^1

K (19) = 1s^2, 2s^2, 2p^6 , 3s^2 , 3p^6 , 4s^1

Answer 2

1)neon-1s2 2s2 2p6

argon- 18. 1s2 2s2 2p6 3s2 3p6

b) noble gas -neon

2)A

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