250 --> 125 --> 62.5 --> 31.25
each arrow equals one half life, so 3 half lives
14 days/ 3 half lives =
4.67 days = half life
Answer:
A.
Explanation:
They lose 1 electrons in their outermost shell.
The proton to electron ratio become unbalanced where the proton overpowers.
Therefore, leaving the ion positively charged.
Answer:
First of all, no such element can form because the described one has a negative charge
Explanation:
The mass of the atom = neutrons + protons
= 16 + 14
= 30
