Extra Credit Assignment

Which element is this?

• Nickel

• Neon

• Sodium

• Nitrogen

What is the atomic number of this atom?

• 2

• 4

• 6

• 8

What is a valence electron?

• Electrons in the first energy shell

• Electrons in the second energy shell

• Electrons in the outer shell

• Total number of electrons

How do covalent bonds form?

• by sharing electrons between atoms

• by donating or receiving electrons

In this chemical equation, the elements in red are the_______.

• Products

• Reactants

• Subscripts

• Coefficients

What is a valence electron?

• an electron that is found in the outermost orbital of an atom. 
• an electron found in the innermost orbital of an atom.
• an electron found in the middle orbital.

Using the information provided, determine how many electrons the a Boron atom contains.

• 2.5

• 5

• 6

• 10.81

Identify the elements in this compound.

• Carbon, Helium, Oxygen

• Chromium, Hydrogen, Oxygen

• Calcium, Hydrogen, Oxygen

• Carbon, Hydrogen, Oxygen

How many molecules are in this formula? (I am not asking about individual atoms here so be careful)

• 1

• 2

• 3

• 6

How many significant figures are in the following number?

100.00