Question

Considering an atom with 34 protons and 45 neutrons:

A. name the element

B. What is the atomic number

C. what is the mass number?

D. How many electrons in the atom?

E. Which, if any of A,B,C,orD change if the atom forms a -2 ion ?

Answer 1

A) for any element number of protons = atomicnumber = 34

34 atomic number = Selenium = Se

B) atomic number = number of protons = 34

C) sum of protons and neutrons = mass number

34 + 45 = 79

D) if it is neutral atom number of protons = number of electrons = 34

E) if atom forms -2 charge then 2 electrons get added to atom so number of electrons will change = 36