Atomic Structure

Which value of an element is calculated using both the mass and relative abundance of each occurring isotopes of this element?

• Atomic number

• Atomic mass

• Half-Life

• Molar volume

Which numerical configuration can be used to get the atomic mass of the elment chlorine?

• (34.97 u)(0.7576)+(36.97 u)(0.2424)

• (34.97 u)(75.76)+(36.97 u)(0.2424)

• (34.97 u)(0.2424)+(36.97 u)(0.7576)

• (34.97 u)(24.24)+(36.97 u)(75.76)

The center of an atom is called the

• Electron shell

• Molecule

• Nucleus

• Atom

Which element is the simplest and lightest atom with just one proton, one electron and no neutron?

• Helium

• Calcium

• Carbon

• Hydrogen

How do you find how many neutrons an atom has?

• Subtracting atomic number from mass number

• Adding atomic number to mass number

Isotopes have the same number of neutrons and protons.

• True

• False

What kind of charge does an electron have?

• Positive

• Negative

• Neutral

• B and C

The mass of an element is the total number of protons and neutrons in the nucleus of the atom.

• True

• False