isotope and count atoms

An aluminum isotope consists of 13 protons, 13 electrons, and 14 neutrons. Its mass number is

• 13
• 14
• 27
• 40

For an atom to be electrically neutral, it must contain the same number of _____

• protons and neutrons
• neutrons and electrons
• protons and electrons
• nucleons and electrons

Different versions of an element, with differing numbers of neutrons, are called _____

• isosceles
• isomers
• isotopes
• isicless

Rounding the atomic weight to the nearest whole number gives us the _____

• proton number
• mass number
• nucleon number
• average weight

number of neutrons =  _____

• atomic number - mass number
• isotope number - atomic weight
• mass number - atomic weight
• mass number - atomic number

How many neutrons does an atom of the isotope Neon-22 have?

• 12
• 10
• 22
• 20

How many neutrons does an atom of Nitrogen-13 have?

• 6
• 7
• 13
• 5

What is the mass number of an atom of gold with 117 neutrons?

• 117
• 196
• 196.97
• 197

Calculate the number of Oxygen atoms in Al(OH)₃

• 1

• 2

• 3

• 4

How many Magnesium atoms are in 10MgCl₂?

• 10

• 5

• 20