Question

identify "triad" system from the following
1. Li,Na,K
2. K,Rb,Cs
3. F,Cl,Br
4. Li,Be,C
​

Answer 1

4. Li,Be,C is the correct answer is

Answer 2

Answer:

1. in a group
2. in a group
3. in a group
4. in a period

hope it helps ❤