Understanding Atomic Mass and Ions

What is an atomic mass unit (amu) defined as?

• The mass of one atom of hydrogen

• One twelfth of the mass of a carbon-12 atom

• The mass of one mole of oxygen atoms

• The mass of a proton

Tags

NGSS.HS-PS1-7

Which term refers to the average mass of atoms of an element, taking into account all its isotopes?

• Isotopic mass

• Formula mass

• Relative atomic mass

• Atomic number

What is the charge of ions formed by elements in Group 1 of the periodic table?

• Group 1

• Group 2

• Group 6

• Group 7

• 23

• 35.5

• 58.5

• 56.5

Which of the following best defines isotopic mass?

• The mass of an atom compared to carbon-12

• The mass of a specific isotope of an element

• The sum of protons and neutrons in an atom

• The mass of a molecule

• 12

• 14

• 16

• 18

Which term refers to the sum of the relative atomic masses of all atoms in a chemical formula?

• Isotopic mass

• Formula mass

• Atomic number

• Molar mass

Tags

NGSS.HS-PS1-7

What is the charge of ions formed by elements in Group 7 of the periodic table?

Which of the following compounds contains ammonium ions?

Tags

NGSS.MS-PS1-1