Question

2)
6
c
carbon
12.01
protons:
neutrons:
electrons:
valence electrons:
3)
2
he
helium
4.00
protons:
neutrons:
electrons:
valence electrons:

Explanation:

Step1: Determine Protons for Helium

The atomic number (top left) is 2, so protons = 2.

Step2: Calculate Neutrons for Helium

Mass number (bottom) is 4. Neutrons = mass number - atomic number = \( 4 - 2 = 2 \).

Step3: Determine Electrons for Helium

In a neutral atom, electrons = protons = 2.

Step4: Determine Valence Electrons for Helium

Helium has a full outer shell with 2 valence electrons (noble gas).

Answer:

Protons: 2
Neutrons: 2
Electrons: 2
Valence Electrons: 2