Isotopes

What does the atomic number of an element represent?

• The total mass of an atom of the element

• The number of protons in an atom of the element

• The number of electrons in an atom of the element

• The number of neutrons in an atom of the element

In an electrically neutral atom, the number of ​ (a)   = the number of ​ (b)   ​

• protons
• electrons
• neutrons
• quarks

What does the symbol of an element represent?

• The number of protons in an atom of the element

• The total mass of an atom of the element

• The number of electrons in an atom of the element

• The name of the element

What does the mass number of an atom represent?

• The number of protons in the nucleus of an atom

• The number of neutrons in the nucleus of an atom

• The number of protons and neutrons in the nucleus of an atom

• The number of electrons in the nucleus of an atom

What are isotopes?

• Atoms of the same element with different numbers of electrons

• Atoms of different elements with different numbers of neutrons

• Atoms of the same element with different numbers of protons

• Atoms of the same element with different numbers of neutrons

How can isotopes be represented in hyphen form?

• Name of element - mass number

• Mass number - symbol

• Symbol - atomic number

• Atomic number - mass number

How can isotopes be represented in nuclear form?

• Symbol - atomic number

• Atomic number - mass number

• Mass number - symbol

• Name of element - mass number

What is the average atomic mass?

• The weighted average of all the isotopes of an element

• The mass of the least common isotope of an element

• The sum of the atomic numbers of all the isotopes of an element

• The mass of the most common isotope of an element

Is the average atomic mass the closest to the most common isotope of the element?

• Yes

• No

Fill out the first two rows of the following table:

a

b

c

d

e

55

25

13

Mn

27

Tags

NGSS.MS-PS1-1