Chapter 3 Atoms

The number of atoms in 1 mol of carbon is

• 6.022 x 10²²
• 6.022 x10²³
• 5.022 x10²²
• 5.022 x 10²³

Oxygen-18 (atomic number 8) contains

• 8 neutrons
• 9 neutrons
• 10 neutrons
• 18 neutrons

The relative atomic mass of an atom can be found by comparing the mass of the atom to the mass of

• one atom of hydrogen-2
• one atom of carbon-12
• one atom of carbon-13
• one atom of carbon-14

As the mass number of an element’s isotopes of an element increases, the number of protons

• decreases
• increases
• stays the same
• doubles

The total number of protons and neutrons in the nucleus of an atom is its

• atomic number
• mass number
• atomic mass
• Avogadro's number

Tags

NGSS.HS-PS1-8

How many isotopes of hydrogen are known?

• 1
• 2
• 3
• 4

Tags

NGSS.HS-PS1-8

The most common form of hydrogen has _____ protons _____ neutrons _____ electrons

• 0, 0, 0
• 1, 0, 1
• 1, 1, 1
• 1, 2, 1

Tags

NGSS.MS-PS1-1

Isotopes are atoms of the same element that have different

• chemical properties
• mass numbers
• protons
• electrons

Tags

NGSS.HS-PS1-8

An atom is electrically neutral because

• neutrons balance the protons and electrons
• nuclear forces stabilize charge
  
• protons and electrons are equal
• electrons and neutrons are equal

Tags

NGSS.HS-PS1-7

Because a few alpha particles bounced back from the foil, Rutherford concluded that they were

• striking electrons
• striking neutrons
• striking protons
• magnetic