Atomic Mass and Number

What is the Atomic Number of this Element

Hint: Count the Protons (+)

• 7

• 3

• 4

• 1

Tags

NGSS.MS-PS1-1

The mass of an atom is located in the _________

• Electron cloud

• Neutrons

• Nucleus

• Protons

Tags

NGSS.MS-PS1-1

If the atomic number of Pb (Lead) is 82 and its atomic mass is 205, how many neutrons does it have?

• 123

• 82

• 205

• 287

Tags

NGSS.MS-PS1-1

Which element is the heaviest?

• Na

• Ar

• Ca

• O

Tags

NGSS.MS-PS1-1

An atom has an atomic number of 11 and an atomic mass of 23. Which of the following statements is correct?

• It has 11 protons and 11 neutrons.

• It has 11 electrons and 12 protons.

• It has 11 protons and 11 electrons.

• It has 23 protons and 11 electrons.

Tags

NGSS.MS-PS1-1

If the atomic mass is the number of protons and neutrons, and the atomic number is the number of protons, how can the number of electrons be determined?

• By subtracting the number of protons by the number of neutrons.

• It is the same as the number of protons.

• By subtracting the number of protons from the atomic mass.

• By adding the protons and neutrons.

Tags

NGSS.MS-PS1-1

Which atom has an atomic mass of 16?

• Na

• Ar

• Ca

• O

Tags

NGSS.MS-PS1-1

Which pair of particles contributes the most to the overall mass of the atom?

• Electrons and protons

• Protons and neutrons

• Electrons and neutrons

How many protons are in a sodium atom? (tap to enlarge the periodic table)

• Sodium has 1 proton.

• Sodium has 3 protons.

• Sodium has 11 protons

Tags

NGSS.MS-PS1-1

Which subatomic particles contribute the most to the mass of an atom?

• Protons, Neutrons, Electrons

• Protons only

• Protons and Electrons

• Protons and Neutrons

Tags

NGSS.MS-PS1-1