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
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
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-
.
- 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.
Similar questions