Question

Periodic classification of elements

Answer 1

Answer:

1)

A- sodium (Na)

B- atomic no. -11

electronic configuration -2,8,1

C- 4Na +o2 ---> 2Na2 +o2

D- it react exothermically with cold water to produce sodium hydroxide .it will have the PH14

Na2O+H2O---> 2NaOH

2)

(I) atomic no. 9 in period 2

atomic no. 17 in period 3

(2) atomic no. 17 will have the largest atomic radius because down the group the atomic radius increase.

(3)yes they are similar because both the metal belong to halogen family.

3)

(a) 11-2,8,1

16-2,8,6

(b) covalent bond

(c) Na2S

4)

(1)Ar

(2) Si, covalent bond

(3)sodium

5)

(a) he and Ar have nobal gas property

F and Cl have the halogen property

(b) he and Ar in 18 group

F and Cl in 17 group

(c) 18 - neon

17-bromine

6)

(a) sodium (Na)

(b) mercury (Hg)

(c) boron

Explanation:

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