protons, neutrons and electrons

protons, neutrons and electrons

OBJECTIVES

• Identify the number of protons, neutrons and electrons

• describe ions

• Calculate the average atomic mass of isotopes

three subatomic particles - Protons, neutrons and electrons

Calculate the number of protons, neutrons and electrons

Multiple Choice

How many electrons does a Copper atom have?

• 63
• 29
• 92
• 34

Multiple Choice

How many neutrons are in a Gold atom?

• 79
• 196
• 118
• 275

Multiple Choice

How many protons are in Beryllium?

• 4
• 9
• 5
• 2

Multiple Choice

Where are electrons found in an atom?

• in the nuclues

• electrons don't exist o_O

• orbiting the nucleus

• Only Josie knows where they are.

ions

Ions are charged particles

Multiple Choice

If an element has 3 valence electrons, what charge will likely form on its ion ?  Hint:  It will lose those electrons.  What happens to the charge when it loses 3 electrons?

• +3
• +5
• -3
• -5

Multiple Choice

A Bromine ion gains 1 electron, which of the following is the correct symbol for a Bromine ion?

• Br^-1

• Br⁺¹

• Br⁺⁷

• Br^-7

Multiple Choice

Why are ions formed?

• To make our lives difficult
• Because atoms want 8 valence electrons
• Because atoms have the same number of protons and electrons
• Because atoms gained neutrons

Isotopes

• Isotopes are atoms of same element with same atomic number but different mass number

Calculation

Multiple Choice

Rubidium has two common isotopes, ⁸⁵Rb and ⁸⁷Rb. If the abundance of ⁸⁵Rb is 72.2% and the abundance of ⁸⁷Rb is 27.8%, what is the average atomic mass of rubidium?

• 85.468 amu

• 37 amu

• 85.6 amu

• 86.4 amu

Multiple Choice

Four isotopes of lead include lead-204, lead-206, lead-207, and lead-208.  The average atomic mass of lead is 207.2.  Which isotope of lead is likely to be the most abundant.

• 204
• 206
• 207
• 208

Open Ended

Calculate the average atomic mass of oxygen if 0-16 is 99.76% abundant,O-17 is 0.04% abundant and O-18 is 0.20%