Question

The number of neutrons in the element Be (Z =4, A = 9) is​

Answer 1

the number of neutrons = 5

Explanation:

the number of neutrons in the element is equal to the difference between the mass number of the element and the atomic number of the element i.e no of neutron =A-Z

A(mass number ) =9

Z(atomic number)=4

A-Z=9-4 =5

number of neutrons in the element having atomic number 4 and mass number 9 is 5 and the element name is beryllium

Answer 2

Answer:9

Explanation:

since Z=4

P=