Chemistry Mid-Term Review

Front

What is the charge of an atom with 2 protons, 3 neutrons, and 4 electrons?

Back

-2

Front

Which type of elements tend to form positive ions?

Back

Metals

Front

What is the closest analogy to Dalton's model of the atom?

Back

Marble

Front

How do you calculate the average atomic mass of an element with multiple isotopes?

Back

Multiply the mass of each isotope by its relative abundance (as a decimal) and sum the results.

Front

Where are valence electrons located in an atom?

Back

In the outer ring.

Front

What is the definition of an ion?

Back

An atom or molecule that has a net electrical charge due to the loss or gain of one or more electrons.

Front

What is the significance of valence electrons in chemical bonding?

Back

Valence electrons determine how an atom can bond with other atoms.

Front

What is Dalton's atomic theory?

Back

1. All matter is made of atoms. 2. Atoms are indivisible and indestructible. 3. All atoms of a given element are identical in mass and properties. 4. Compounds are formed by a combination of different kinds of atoms.

Front

What is the mass number of an atom?

Back

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

Front

What is the difference between atomic mass and mass number?

Back

Atomic mass is the weighted average mass of an element's isotopes, while mass number is the total count of protons and neutrons.