isotopes

Fluorine has an atomic number of 9. What can you conclude about an atom of fluorine from this fact?

• it has 9 protons
• it weighs 9 grams
• it has 9 electron shells
• it has a boiling point of 9 degree celsius

Tags

NGSS.MS-PS1-1

In what part of an atom can protons be found?

• inside the electron
• inside the neutron
• inside the atomic nucleus
• inside the electron shells

Tags

NGSS.MS-PS1-1

Since atoms are very small, what can you infer about atomic mass units?

• one atomic mass unit is equivalent to a gram
• one atomic mass unit is much lighter than a gram
• one atomic mass unit is much heavier than a gram
• atomic mass units and grams measure different properties

An atom of fluorine has an atomic mass of 19 u. Keeping in mind that its atomic number is 9, what can you infer about this atom?

• it has 9 neutrons
• it has 10 electrons
• it has 10 neutrons
• it has 10 protons

If a sulfur atom has 16 protons, 16 electrons, and 16 neutrons, its atomic mass is:

• 16
• 32
• 48
• 64

Tags

NGSS.MS-PS1-1

If a hydrogen atom has 1 proton, 1 electron, and 1 neutron, its atomic number is:

• 1
• 2
• 3
• 4

Tags

NGSS.MS-PS1-1

On the periodic table, how is atomic mass represented?

• As an average of the mass of different isotopes
• as the exact mass of every atom
• as the mass of the most common isotopes
• As the masses of all protons added together

What do carbon-12 and carbon-14 have in common?

• they have same number of protons
• they have the same number of neutrons
• they have the same atomic mass
• they have the same atomic weight

Tags

NGSS.HS-PS1-8

How is carbon-12 different from carbon-14?

• They have a different number of protons
• they have a different number of electrons
• they have a different number of neutrons
• they are different elements

What can you conclude about carbon-14 from its name?

• It has 14 electrons
• it has 14 neutrons
• it has 14 protons
• it has an atomic mass of 14 u

Tags

NGSS.MS-PS1-1