Chemistry, asked by ayankhan53001, 1 month ago

The following questions are related with the certain properties of an element X having atomic
number 20.
Identify element >
Give its electronic configuration
Is it a metal or a non-metal
How many valence electrons are present in element X.
Is this element greater in size than Mg or smaller.
11 17 16. 12 and 18 respectively. With​

Answers

Answered by maalakshminaryan
0

Answer:

20 is calcium

e. c. 2,8,8,2

the size of Ca is 231pm

and mg is 173pm

it is a metal

v is -2

11 is na that is sodium

it is a metal

e.c. is 2,8,1

v is -1

17 is Cl that is chlorine

e.c. is 2,8,7

it is a non metal

v is +1

16 is s that is sulfur

it is a non metal

e. c. is 2,8,6

v is +2

18 is Ar that is argon

it is a noble gas

e. c. is 2,8,8

v is 0

12 is mg

Magnesium

it is a metal

e. c. is 2,8,2

v. is -2

Answered by qwmagpies
0
  • X has atomic number 20. So, X is Calcium or Ca. Ca is a group II element resides at period 3 of modern periodic table.
  • Electronic configuration of Ca is-

1s^22s^22p^63s^23p^64s^2.

  • Calcium is an alkaline earth metal.
  • It has 2 valance electrons in its 4s orbital.
  • It is greater in size than Mg due to large atomic number.
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