Yes your choices of B C D are right
2.2 x 10^-2
0.055 / 250 = 0.00022 - This would be 2.2 x 10^-4, but the question is asking for percent, not proportion, so multiply by 100% to get the percentage.
0.00022 * 100% = 0.022% = 2.2 * 10^-2
The answer that i found is 4.650
Answer:
A small positively charged nucleus surrounded by revolving negatively charged electrons in fixed orbits
Answer:
They are all physical exept c
Explanation:
