Which of the following is NOT a way to symbolize an isotope?

• Element-mass number (ex. helium-4)

• Symbol-atomic number (ex. He-2)

• Symbol-mass number (ex. He-4)

• Symbol w/ mass number and atomic number (4He)

Isotopes of the same element must have different numbers of____.

• Protons

• Neutrons

• Electrons

• Both A & B

A neutral atom of Chlorine-37 has ___.

• 37 protons, 37 neutrons, and 37 electrons

• 17 protons, 37 neutrons, and 17 electrons

• 17 protons, 20 neutrons, and 37 electrons

• 17 protons, 20 neutrons, and 17 electrons

Tags

NGSS.MS-PS1-1

Isotopes of the same elements must have the same number of ____.

• Protons only

• Protons and electrons

• Neutrons only

• Protons and neutrons

An unknown isotope contains 15 protons, 15 electrons, and 17 neutrons. What is the identity of this unknown isotope?

• P-15

• P-17

• P-30

• P-32

Tags

NGSS.MS-PS1-1

In the isotope B-11, what does the 11 represent?

• Atomic number

• Mass number

• Average atomic mass

• Number of neutrons

Which isotope has a mass number of 14 and 8 neutrons?

• N-14

• O-18

• C-14

• B-11

How many neutrons are in an atom of Sr-86?

• 48

• 58

• 86

• 106

True or False: For a neutral (uncharged) atom, the number of electrons is equal to the number of protons.

• True

• False

True or False: There are 86 electrons in an (uncharged) atom of Sr-86.

• True

• False

Tags

NGSS.MS-PS1-1