Question

Fill  in  the  blanks

1. The  group  number  of  the  element  neon  is  _.
2. The  period  number  of  the  element  aluminium  is_.
3. Horizontal  similarity  can  be  observed  in  the  period  number
4. The  first  element  of  14th  group  is  carbon  which  is  a  non-metal.
5. The  metallic  members  of  this  group  are_.

DSERT Class 10 Science Ch 3 Periodic Classification of Elements

Answer 1

1. The group number of the element neon is 18.
2. The period number of the element aluminium is 3.
3. Horizontal similarity can be observed in the period number 6 and 7
4. The first element of 14th group is carbon which is a non-metal .
5. The metallic members of this group are tin and lead.

Answer 2

⇒ The group number of the element neon is 18.
⇒ The period number of the element aluminium is 3.
⇒ Horizontal similarity can be observed in the period number 6 & 7
⇒ The first element of 14th group is carbon which is a non metal .
⇒ The metallic members of this group are tin & lead.