Test 4 & 5 (Elements and the Periodic Table

Democritus coined what word for a tiny piece of matter that cannot be divided?

• element

• molecule

• electron

• atom

Who provided evidence for the existence of a nucleus in the atom?

• Democritus

• Rutherford

• John Dalton

• J. J. Thomson

Tags

NGSS.HS-PS1-8

Which of the following is unique for any given element?

• neutron

• electro

• alpha particle

• proton

Which statement is true about oxygen-17 and oxygen-18?

• Their atoms have an identical mass

• They are isotopes of oxygen

• They do not have the same number of protons

• They have the same mass number

What is the difference between an Atom in the ground state and an atom in the excited state?

• The atom in the excited state has more energy & is less stable

• The atom in the ground state has less energy & is less stable

• The atom in the excited state has one fewer electron

• The atom in the excited state has one more electron

In a periodic table, a set of properties repeats from

• column to column

• element to element

• group to group

• row to row

Tags

NGSS.HS-PS1-1

In Bohr's model of the atom, electrons move

• like planets around the sun

• like balls rolling down a hill

• like in a popcorn popper

• like beach balls on water waves

To find the number of neutrons in an atom, you would subtract

• mass number from atomic number

• atomic number from electron number

• isotope number from atomic number

• atomic number from mass number

Which subatomic particle has a negative charge?

• proton

• electron

• neutron

• alpha particle

Which of the following is NOT part of John Dalton's atomic theory?

• All elements are composed of atoms

• All atoms of the same element have the same mass

• Atoms contain subatomic particles

• A compound contains atoms of more than one element.