NC Physical Science Review Chem

An atom has 29 protons, 29 electrons, and 35 neutrons.  What is the mass number of the atom?

• 29
• 35
• 64
• 93

How many protons and neutrons are there in an atom of Boron?

• 5 protons, 6 neutrons
• 5 protons, 11 neutrons
• 11 protons, 5 neutrons
• 11 protons, 6 neutrons

Tags

NGSS.MS-PS1-1

Which pair of elements has the most physical and chemical properties in common?

• Ge and Se
• K and Kr
• Al and Ga
• Ba and Bi

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

A gemstone has a mass of 6.24 grams and a volume of 1.98 cm3.  What is the density of the gemstone?

• 2.20
• 3.01
• 3.15
• 3.50

Which accounts for most of the mass of an atom?

• electrons
• protons
• neutrons and protons
• electrons and neutrons

Tags

NGSS.HS-PS1-7

What kind of bond is responsible for atoms of pure gold to remain bonded?

• covalent
• hydrogen
• ionic
• metallic

Which describes an atom with an atomic number of 9?

• 10 protons, 9 neutrons
• 9 protons, 10 neutrons
• 4 protons, 5 neutrons
• 3 protons, 3 neutrons

Tags

NGSS.MS-PS1-1

Which best represents how electrons are arranged in the energy levels of a carbon atom?

• 1 electron in first energy level, 5 electrons in the second energy level
• 2 electrons in first energy level, 4 electrons in the second energy leve
• 3 electrons in first energy level, 3 electrons in the second energy leve
• 4 electron in first energy level, 2 electrons in the second energy leve

Tags

NGSS.HS-PS1-1

How many neutrons are in an atom of Pu-246?

• 94
• 150
• 152
• 246

Which element has the same number of valence electrons as Krypton (Kr)?

• Neon (Ne)
• Fluorine (F)
• Chlorine (Cl)
• Selenium (Se)

Tags

NGSS.HS-PS1-1