Question

The following table lists the atomic number and mass

number of five elements A, B, C, D and E.

Element Mass number Atomic number

A 3 1

B 7 3

C 35 17

D 40 18

E 37 17

I) How many protons are there in an atom of B?

II) How many neutrons are there in atom of A?

III) How many electrons are there in atom of E?

IV) Which atoms are isotopes of the same element? explain step by step​

its chemistry

Answer 1

Answer:

I) 3

II) 2

III) 17

IV) C and E are isotopes

Answer 2

Answer:

I)Atomic no.=proton no.=3

II)Neutron no.=Mass no.-Atomic no.=3-1=2

III)Atomic no.=Proton no.=Electron no.=17

IV)E and C are the isotopes of the same element that is of Chlorine because they have same Atomic no. but different Mass no.