D. 8
You can predict it from it's name "Octet" means Eight. Atom must have that number of electron to have a stable structure!
Hope this helps!
When oxygen is found is peroxide, it has an oxidation number of -1.
The chemical formula of hydrogen peroxide is H2O2. We know that hydrogen always has +1 oxidation state until it forms metal hydrides. So in H2O2, the oxidation state ofhydrogen is +1.
Now, let oxidation state of oxygen be x. So,
2 * (+1) + 2*x = 0
2 + 2x = 0
2x = -2
x = -2 / 2
x = -1
Hence, the oxidation number of oxygen in peroxides is -1
Answer:
1)alkali metals
2)1g/ml
3) mercury
Explanation:
<em><u>HEY!</u></em><em><u>!</u></em><em><u>^</u></em><em><u>^</u></em>
<em><u>have </u></em><em><u>a </u></em><em><u>good </u></em><em><u>day</u></em>
<em><u>thank </u></em><em><u>me </u></em><em><u>later</u></em>
<em><u>carryonlearing </u></em>
1 mol --------- 6.02x10²³ atoms
6.3 moles ---- ??
atoms = 6.3 * 6.02x10²³
= 3.7926x10²⁴ atoms
hope this helps!