If you had 4 protons and 5 neutrons you created which element *

Beryllium

Explanation:

No. of protons = 4

No. of electrons = 4 (number of protons and neutrons are the same)

No. of neutrons = 5

You need to look at the number of electrons of the outer shell (group no.) there are and how many shells there are (period no.)

Then look at the period table of elements to find the element

10 years is the answer