3.3 : How Atoms Differ

Essential Question: Are all atoms identical?

• Yes, all atoms are identical.

• No, atoms are not identical.

• Only some atoms are identical.

• Atoms are identical only in certain conditions.

Tags

NGSS.HS-PS1-2

What is the atomic number of Hydrogen?

• 1

• 2

• 3

• 4

Tags

NGSS.MS-PS1-1

What is the chemical symbol for Hydrogen?

• H

• He

• O

• N

What is the average atomic mass of Hydrogen?

• 1.008 u

• 1.000 u

• 1.010 u

• 1.012 u

Tags

NGSS.MS-PS1-1

The atomic number of an atom is determined by:

• the number of protons in the nucleus

• the number of neutrons in the nucleus

• the number of electrons in the atom

• the total number of protons and neutrons

The number of protons in an atom is equal to the number of ________.

• electrons

• neutrons

• atoms

• molecules

The mass number of an atom is:

• the number of protons in the nucleus

• the number of neutrons in the nucleus

• the total number of protons and neutrons in the nucleus

• the number of electrons in the atom

Atoms of the same element with different numbers of neutrons are called:

• Isotopes

• Ions

• Molecules

• Compounds

Isotopes have different atomic masses because:

• they have different numbers of protons.

• they have different numbers of neutrons.

• they have different numbers of electrons.

• they have different atomic numbers.

The definition of 'atomic mass unit (u)' is:

• The mass of a single proton or neutron

• The mass of a single electron

• The mass of a single atom

• The mass of a single molecule