Basic Chem Final Review

The nucleus of an atom has all of the following characteristics except that it

• is very dense.
• contains protons and neutrons.
• is positively charged.
• contains almost all of the atom’s volume.

Tags

NGSS.HS-PS1-8

What makes an atom electrically neutral?

• The neutrons balance out the protons and electrons.
• The nuclear forces contained in the atom neutralize the atom.
• The number of protons is equal to the number of electrons.
• The number of protons is equal to the number of neutrons.

Tags

NGSS.HS-PS1-7

The smallest particle of an element that retains the properties of that element is a(n)

• electron
• atom
• proton
• quark

What does the number 91 represent in the name zirconium-91?

• the atomic number
• the number of protons
• the mass number
• the sum of protons and electrons

Tags

NGSS.HS-PS1-8

An element has an atomic number of 72. The number of protons and electrons in a neutral atom of this element is

• 72 protons and 72 electrons
• 72 protons and 0 electrons
• 36 protons and 36 electrons
• none of the above

Which of the following sets is correct?

• Zn-65, 65 protons, 65 electrons
• Mg-24, 12 protons, 12 neutrons
• U-238, 92 protons, 92 neutrons
• Pb-207, 207 protons, 207 electrons

Tags

NGSS.HS-PS1-1

An atom has an atomic number of 32 and a mass number of 73. How many protons, neutrons, and electrons does this atom contain?

• 32 protons, 73 neutrons, 32 electrons
• 73 protons, 73 neutrons, 41 electrons
• 32 protons, 41 neutrons, 32 electrons
• 41 protons, 32 neutrons, 41 electrons

Tags

NGSS.MS-PS1-1

Identify the element that has 31 neutrons and a mass of 59.

• gallium
• praseodymium
• thorium
• nickel

Tags

NGSS.MS-PS1-1

Isotopes of the same element have different

• chemical properties.
• masses.
• atomic numbers.
• number of protons.

All atoms of the same element have the same

• number of protons.
• mass number.
• number of neutrons.
• protons and neutrons.