Question

The atomic number of three elements a B C are given below a is 5 b is 7 c is 10

Which element belongs to group 18
Which element belongs to group 15
Which element belongs to group 13

To which period do these belong





From the following given
Mg si na CL AR ph

Which of these form strongest basic oxide?
Which of these has electron configuration 2 8 4?
Which of these is an alkaline earth metal?
Which of these is an alkali metal?
Which of these has smallest size and which of these has largest size
Which of these is most non metallic?
Rearrange the following in order of decreasing chemical reactivity
K li na
Na Mg al
CL br iodine​

Answer 1

Answer:

1. C belongs to grp 18.

2.B belongs to 15.

3. A belongs to 13.

these all belongs to 2 period.

si has electron configuration 2,8 ,4.