Question

Write down the electronic configurationof the following elements from the given atomic numbers .Answer the following question with explanation. a.3Li,14,Si,2He,11Na,15P Which of these elements belong to the period 3? b.1H,7N,20Ca,16S,4Be,18Ar Which of this elements belong to the second group ? c.7N,6C,8O,5B,13Al Which is the most electronegative element among these? d.4Be,6C,8O,5B,13Al Which is the most electropositive amongst these? e.11Na,15P,17Cl,14Si,12Mg whish of these has largest atoms ? f.19K,3Li,11Na,4Be Which of these atoms has smallest radius ? g.13Al,14Si,11Na,12Mg,16S Which of the following element has the highest metallic character? And last one h.6C,3Li,9F,7N,8O Which of the above elements has the highest nonmetallic characters ?

Answer 1

Answer:

a. Electronic conf. of

1. Li = 2,1

2. Si = 2,8,4

3. He = 2

4. Na = 2,8,1

5. P = 2,8,5

Here, Na, Si, P are in period 3

b. Electronic conf. of

1. H = 1

2. N = 2,5

3. Ca = 2,8,8,2

4. S = 2,8,6

5. Be = 2,2

6. Ar = 2,8,8

Here, Be and Ca belong to 2nd group

c. Electronic conf. of

1. N = 2,5

2. O = 2,6

3. C = 2,4

4. B = 2,3

5. Al = 2,8,3

Most electronegative is O

d. Most electropositive = Al

e. Largest atom is Na