The electronic configurations of three elements X, Y and Z are:

X : 2 Y : 2, 8, 7 Z : 2, 8, 2

Which of the following is correct regarding these elements?
(a) X is a metal
(b) Y is a metal
(c) Z is a non-metal
(d) Y is a non-metal and Z is a metal

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Solution

(d) Y is a non-metal and Z is a metal.

Element Y has 1 less electron to complete its octet which is a property of non-metals. On the other hand, element Z has 2 extra electrons to become stabilised which is a property of metals.

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Question 30
The electronic configurations of three elements X, Y and Z are
X — 2, 8; Y — 2, 8, 7 and Z — 2, 8, 2. Which of the following is correct?

The element whose electronic configuration is $1 s^{2}, 2 s^{2}, 2 p^{6}, 3 s^{2}$ is a/an?

3 p^{6}, 3 d^{9}

X, Y, Z

J

X = 2, 8, 4

Y = 2, 8, 8

Z = 2, 8, 8, 1

J = 2, 8, 8, 7

X, Y, Z

T

X : 2, 8, 4

Y : 2, 8, 8

Z : 2, 8, 8, 1

T : 2, 8, 8, 7

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