Question

An atom has a mass number of 9 and 5 neutrons. What is its atomic number?

O A. 19
B. 14
C. 11
D. 4

Answer 1

Answer: B 4

Explanation:approved

Answer 2

D.4

Step-by-step explanation:

Number of neutron= mass number - atomic number

where; d no of neutron is 5

d mass no is 9

atomic number be x

5=9-x

x=9-5

x=4