Periodic Table

Front

What is the atomic number of an element?

Back

The atomic number is the number of protons in the nucleus of an atom, which determines the element's identity.

Front

How many protons and electrons does nickel have?

Back

Nickel has 28 protons and 28 electrons.

Front

How do you calculate the number of neutrons in an atom?

Back

Number of neutrons = Mass number - Atomic number.

Front

What are the horizontal rows on the periodic table called?

Back

The horizontal rows are called periods.

Front

Who proposed a model with electrons moving in specific layers?

Back

Niels Bohr proposed the model with electrons in specific layers.

Front

Who discovered the nucleus of the atom?

Back

Ernest Rutherford discovered the nucleus.

Front

What are the vertical columns on the periodic table called?

Back

The vertical columns are called groups or families.

Front

What is the significance of the periodic table?

Back

The periodic table organizes elements based on their atomic number, electron configuration, and recurring chemical properties.

Front

What is an isotope?

Back

Isotopes are atoms of the same element that have the same number of protons but different numbers of neutrons.

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.