8.5a/b

The model above shows which atom (8.5B)?

• Carbon

• Beryllium

• Lithium

• Nitrogen

Tags

NGSS.MS-PS1-1

How many valence electrons does the element illustrated above have (8.5B)?

• 1

• 3

• 7

• Impossible to tell

Tags

NGSS.MS-PS1-1

An atom has 30 protons, 30 electrons, and 31 neutrons. What is the overall charge of the atom’s nucleus (8.5A)?

• Positive

• Negative

• Neutral

• Impossible to tell

Which of these is an accurate comparison of the proton and neutron (8.5A)?

• Protons and neutrons are the same mass and charge

• Protons and neutrons are both located in the nucleus

• Protons and neutrons are not as massive as electrons

• Protons and neutrons have nothing in common with each other

What charge are protons (8.5A)?

• Positive

• Negative

• Neutral

• Impossible to tell

An atom of a certain element has 36 protons, 36 electrons, and a mass number of 84. At room temperature this element is a very stable gas. How many neutrons are in this atom? (8.5A)

• 84

• 36

• 48

• 72

Tags

NGSS.MS-PS1-1

What is most likely the identity of the above atom (8.5B)?

• Nitogren

• Carbon

• Oxygen

• Boron

Tags

NGSS.MS-PS1-1

8. What is wrong with the above diagram (8.5A)?

• There is nothing wrong with the diagram

• The protons are in the wrong place

• There are no neutrons in the nucleus

• There are too many electrons in the first energy level

Tags

NGSS.MS-PS1-1

A student is studying calcium, a highly reactive element that humans need for strong bones. Which characteristic of calcium is most closely related to its chemical reactivity (8.5B)?

• The 20 protons in each atom of calcium

• The density of calcium, which is 1.54 g/cm3

• The atomic mass of calcium, which is 40.078 AMU

• Calcium’s 2 valence electrons

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

Which of the following best describes the electron (8.5A)?

• It has no charge and about the same mass as a proton

• It has a negative charge and much less mass than a proton

• It has a positive charge and much more mass than a neutron

• It has a negative charge and about the same mass as a neutron

Tags

NGSS.MS-PS2-3