Answer:
The periodic table also has a special name for its vertical columns. Each column is called a group. The elements in each group have the same number of electrons in the outer orbital. Those outer electrons are also called valence electrons.
Answer:
gains 2 electrons. In order for the new ionic compound to form a a neutral compound, the oxygens must gain 6 electrons
<u>Answer:</u>
1.1328 g left after 15.6 years
<u>Explanation:</u>
First we need to find, that how many times it decays: 15.6 ÷ 2.60 = 6 times
Then we know the formula: mass of original ÷ 2^n = remaining mass.
: 72.5 ÷ 2^6 = 1.1328 g left.
- Note here n is the number of time, it decays.