Question

Please help me w/q 12 .13 H.W please ​show work

Answer 1

12: Helium

Step-by-step explanation:

In the picture:

- Red particles correspond to protons (because they are in the nucleus and they are positively charged)

- Green particles correspond to neutrons (because they are in the nucleus and they are uncharged)

- Yellow particles correspond to electrons (because they orbit the nucleus and they are negatively charged)

This atom as 2 protons and 2 electrons. This means it corresponds to the 2nd element in the periodic table (atomic number = 2), so it corresponds to helium.

13: Electrons should be arranged in 3 separate orbitals: 2 electrons in an orbital closer to the nucleus, another 2 in a second orbital, and the remaining 3 in the last orbital

Step-by-step explanation:

The electron configuration for nitrogen is:

`1s^2 2s^2 2p^3`

which means:

`1s^2` --> the closest orbital to the nucleus, energy level = 1, orbital s, containing 2 electrons

`2 s^2` --> second closest orbital to the nucleus, energy level = 2, orbital s, containing 2 electrons

`2p^3` --> third closest orbital to the nucleus, energy level = 3, orbital p, containing 3 electrons