Which element has the least number of protons?

• Calcium (Atomic Number 20)

• Bromine (Atomic Number 35)

• Chlorine (Atomic Number 17)

• Neon (Atomic number 10)

Which of the following would be classified as a homogeneous mixture?

• Milk

• Aluminum

• Concrete

• Oxygen Gas

What is a compound?

• Substance that contains two or more types of colors.

• substance that contains two or more types of mixtures.

• substance that contains two or more types of states.

• Substance that contains two or more types of elements.

Tags

NGSS.MS-PS1-1

Which of the following is the best definition of the Bohr Model?

• There is a "sea of electrons" that are free to move

• The electrons stay in place attached to individual protons

• The electrons leave the atom to make positive ions

• the electrons travel around the nucleus in a circular orbit

What part of the atom has a positive charge?

• proton

• neutron

• electron

Which of the following can be classified as an element?

• Calcium (Ca)

• NaCl (table salt)

• H₂O (water)

• milk

Tags

NGSS.MS-PS1-1

What is the Mass Number of Carbon that has 6 protons, 8 neutrons and 6 electrons?

• 6

• 12

• 14

• 20

How can you tell that an atom has gone through Alpha Decay?

• Its atomic number decreased by 1

• Its atomic number decreased by 2

• Its atomic number increased by 1

• Its atomic number increased by 2

Which of the following types of radioactive decay releases the most energy?

• Alpha Decay

• Beta Decay

• Gamma Decay

• Electron Decay

Tags

NGSS.HS-PS1-8

Which of the following elements would be the product of radioactive Beta decay of Protactinium (Atomic Number 91)?

• Actinium (Atomic Number 89)

• Thorium (Atomic Number 90)

• Protactinium (Atomic Number 91)

• Uranium (Atomic Number 92)

Tags

NGSS.HS-PS1-8