Atomic Structure and Bonding

An element has 20 neutrons and 15 protons. Find the mass number of the atom.

• 25

• 20

• 30

• 35

Find the number of neutrons in the nucleus of an atom with atomic number 17 and mass number 37.

• 17

• 18

• 19

• 20

The smallest particle of an element.

• Element

• Molecule

• Atom

A substance that cannot be broken down into other substances by chemical or physical means.

• Covalent bond

• Atom

• Element

A chemical bond where electrons are shared between two atoms. In this type of bond no ions are. You will find these bonds when carbon bonds to other elements.

• Covalent bond

• Element

• Hydrogen bond

A chemical bond that has hydrogen covalently bonded to an electronegative atom. It happens when oxygen bonds to hydrogen.

• Ionic bond

• Hydrogen bond

• Molecule

A combination of two or more atoms

• Period

• Molecule

• Atom

• Family

A chemical bond between two atoms where one or more electrons are passed from one atom to another. When they give up electrons, each of the atoms should have a filled shell. An example is the sodium chloride bond.

• Ionic bond

• Hydrogen bond

• Element

• Covalent bond

What is one way Neutrons are different from electrons?

• they both are negative

• neutrons have no charge, while electrons have a negative charge

• Both are in the nucleus( center of atom)

• Electrons are inside nucleus and neutrons are outside the nucleus.

What is the atomic number?

• 35

• 18

• 17

• 52