Valence electrons & Molecules

Which of the following elements is stable?

• Oxygen

• Neon

• Hydrogen

• Carbon

Which of the following elements are stable?

• Helium

• Hydrogen

• Sodium

• Bromide

Which of the following elements are unstable?

• Carbon

• Argon

• Krypton

• Oxygen

Two or more atoms chemically bonded together are called a

• atom
• element
• molecule
• mixture

Which subatomic particles are much smaller than the others and have a negative charge?

• protons

• neutrons

• electrons

The positive particles of an atom are ___________.

• electrons

• protons

• neutrons

Which is an electron?

• A
• B
• C

How many electrons go in the first shell (ring) ?

• 6

• 8

• 4

• 2

What makes the element carbon so special?

• It is next to oxygen on the periodic table.

• It can form up to 4 bonds

• All life produces carbon

• It's not special

With a molecule of water, the electrons are...

• together

• transferred

• shared

• not transferred or shared