Atomic Structure Review

The atomic number of an atom is always equal to the number of its

• protons plus neutrons

• protons plus electrons

• protons, only

• neutrons only

Which statement concerning elements is true?

• all atoms of a given element must have the same atomic number

• different elements must have different numbers of isotopes

• all atoms of a given element must have the same mass

• different elements must have different numbers of neutrons

After bombarding a gold foil sheet with alpha particles, scientists concluded that atoms consist mainly of

• protons

• electrons

• neutrons

• empty space

Tags

NGSS.MS-PS1-1

The nucleus is the part of the atom that

• has a negative charge

• contains most of the the atoms total mass

• occupies most of the atoms total volume

• consists mostly of empty space

The major portion of atom's mass consists of

• neutrons and protons

• electrons and neutrons

• neutrons and positrons

• electrons and protons

Tags

NGSS.MS-PS1-1

What is the charge and mass of a proton?

• charge of +1 and mass of 1/1836 amu

• charge of +1 and mass of 1 amu

• charge of -1 and mass of 1/1836 amu

• charge of -1 and mass of 1 amu

What are the characteristics of a neutron?

• it has no charge and no mass

• it has no charge and a mass of 1 amu

• it has a charge of +1 and no mass

• it has a charge of +1 and a mass of 1 amu

Which of the following particles has the smallest mass?

• neutron

• proton

• hydrogen atom

• electron

What is the total number of protons contained in the nucleus of a carbon-14 atom?

• 14

• 6

• 12

• 8

What is the total number of electrons in an atom of an element with an atomic number of 18 and a mass number of 40?

• 18

• 22

• 40

• 58

Tags

NGSS.MS-PS1-1