Module 1 Exam

An atom of chlorine contains 15 neutrons. What is the mass number of this atom?

Tags

NGSS.HS-PS1-8

An ion of sodium (Na) has a charge of 1+ and a mass number equal to 25. How many neutrons does this ion contain?

• 12 neutrons

• 10 neutrons

• 11 neutrons

• 14 neutrons

• 25 neutrons

Tags

NGSS.MS-PS1-1

An ion of Bromine (Br) has a charge of 1- and a mass number of 80. How many electrons does this ion contain?

• 36 electrons

• 35 electrons

• 34 electrons

• 45 electrons

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

An atom of Cesium (Cs) contains 52 electrons. What is the charge of this ion?

• +3

• +1

• -3

• 0

Tags

NGSS.HS-PS1-1

The nucleus of an atom is composed of _____

• electrons and neutrons

• Just neutrons

• Protons and electrons

• Just protons

• Protons and neutrons

Tags

NGSS.HS-PS1-8

A neutral atom contains 26 electrons and has a mass number equal to 58. This must be an atom of what element?

• Iron (Fe)

• Nickel (Ni)

• Cobalt (Co)

• Copper (Cu)

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

An atom contains 33 neutrons and has a mass number equal to 70. This must be an atom of what element?

• Bromine (Br)

• Gallium (Ga)

• Zinc (Zn)

• Rubidium (Rb)

Tags

NGSS.HS-PS1-1

How many electrons does Mn+3 contain?

Tags

NGSS.HS-PS1-1

The average atomic mass of an element is the ___

• total number of subatomic particles in the nucleus (protons + neutrons)

• weighted average of the masses of the isotopes of the element

• total mass of the isotopes of the element

• average of the mass number and the atomic number for the element

How many neutrons in C-14?

• 14

• 6

• 8

• 7