Just remember how many electrons can each sublevel hold.
S=2
P=6
D=10
Since we have 10 for atomic number, we can assume we have 10 electrons
1S2
2S2
2P6
The rest have zero because we already have 10 (2+2+6=10)
A Liquid called Surface Tension.
Much heat (in calories) must be applied to a 100 ml beaker filled with boiling water in order to vaporize the water is: 540 calories needed per gm of water of turn to steam, so to boling 100 ml water you need 54,000 (5.4 x 10^4) calories into steam.
hope this help
Answer is letter C: chromosomes