21. An element A belongs to the third period and 19 group of the perio

1.	21. An element A belongs to the third period and 19 group of the periodic table, then find outwhether A is metal or Non-metal.22. Discuss how size of elements varies when we move from up to down within a group ?
Answer» Answer: first of all 19 group doesn't exist in the PERIODIC table on moving up to down size of the elements increase Explanation: for EXAMPLE lithium size = 152 sodium size = 186

21. An element A belongs to the third period and 19 group of the periodic table, then find outwhether A is metal or Non-metal.22. Discuss how size of elements varies when we move from up to down within a group ?

Answer»

Answer:

first of all 19 group doesn't exist in the PERIODIC table

on moving up to down size of the elements increase

Explanation:

for EXAMPLE lithium size = 152

sodium size = 186