Atomic Structure and Electron Configuration

Front

What is the mass number?

Back

The sum of the number of positive protons (P) and the number of neutral neutrons (n) in the nucleus.

Front

What is the atomic number?

Back

The number of positive protons or the number of negative electrons (e-).

Front

How do you calculate the number of neutrons?

Back

Number of neutrons = mass number – atomic number.

Front

Can the number of neutrons be equal to or greater than the number of protons?

Back

Yes, the number of neutrons may be equal to or greater than the number of protons.

Front

What is the formula to calculate the maximum number of electrons in an energy level?

Back

The maximum number of electrons in an energy level can be calculated from the relation (2n²), where (n) is the number of the energy level.

Front

How many electrons can the 1st energy level (K) hold?

Back

The 1st level (K) can hold 2 electrons.

Front

How many electrons can the 2nd energy level (L) hold?

Back

The 2nd level (L) can hold 8 electrons.

Front

How many electrons can the 3rd energy level (M) hold?

Back

The 3rd level (M) can hold 18 electrons.

Front

How many electrons can the 4th energy level (N) hold?

Back

The 4th level (N) can hold 32 electrons.

Front

What is the maximum number of electrons that the outermost energy level of any atom can take?

Back

The outermost energy level of any atom can't take more than 8 electrons, except the K level which can't take more than 2 electrons.