Type of Atoms

For an atom to be neutral, the number of protons must equal the number of (a)   .

• Neutrons

• Electrons

• Atoms

• Molecules

Which of the following statements is true? A) Atoms have a net positive charge B) Atoms have a net negative charge C) Atoms are electrically neutral D) Atoms have more protons than electrons.

• Atoms have a net positive charge

• Atoms have a net negative charge

• Atoms are electrically neutral

• Atoms have more protons than electrons

What is the atomic number of Helium?

• 1

• 2

• 3

• 4

Helium is less dense than air, so it is used in (a)   .

• Cars

• Balloons

• Ships

• Trains