Question

Table
Elements
Mass No.
Atomic No.
A
1
1
B
7
3
C
7
C
40
18
E
40
20
1) Which of them is not a cation?
B
b. A
c. C
d. E
с. С
d. E
2) Which of them is an anion?
B
b. A
3) Which of them is a pair of isobar?
2 Cand E
b.D and E
C. A and B
d. B and C
4) Which is an atom of a noble gas?
А. В
b. A
c. D
d. B
5) Say true or false. Elements A and B are isobars of each other.​

Answer 1

Answer:

1 b is the answer it is coorrct