Could you help me with 2 Chemistry questions?

Question

1) Identify the atom below.

http://media01.owotw.com/ipc_2008/2/helium_atom.jpg

A) Hydrogen

B) Helium

C) Beryllium

D) Carbon

2. Identify the atom below.

http://media01.owotw.com/ipc_2008/2/sodium_atom.jpg

A) Helium

B) Oxygen

C) Neon

D) Sodium

Answer 1

Chem Guy you crazy dude you!

You're getting all valence and Aufbau on this answer!

I'm impressed that you interpreted the shells for him. Props.  

Answer 2

Looks like:

1)

B) Helium with 1s2 configuration (2 electrons in 1s orbital)

2) Sodium with 1s2, 2s2, 2p6, 3s1 configuration (11 total electrons)

Answer 3

Count the circling electrons on the diagrams.

1) Answer is B, Helium, because it has 2 circling electrons. If you look on the Periodic Table, Helium's atomic number is 2, which is also the number of protons and electrons it holds.

2) Answer is D, Sodium, because it has 11 circling electrons. If you look on the periodic table you'll see that Sodium's atomic number is 11, which is also the number of protons and electrons.

Extra hint: To find the number of neutrons in an atom, take its atomic mass and subtract its atomic number from it.

Ex: Fluorine, F, has an atomic number of 9 and an atomic weight of 19.00, therefore:

19-9= 10 neutrons

Fluorine has:

- 9 Protons

- 9 Electrons

- 10 Neutrons

Hope this helps.