Periodic Table

Front

What are valence electrons?

Back

Valence electrons are the electrons in the outermost shell of an atom that are involved in forming bonds with other atoms.

Front

How many valence electrons does lead (Pb) have?

Back

Lead (Pb) has 4 valence electrons.

Front

What is the formula to calculate the number of neutrons in an atom?

Back

Mass - Atomic number = Neutrons.

Front

What do the horizontal rows on the periodic table represent?

Back

The horizontal rows (periods) represent the number of energy levels (orbitals) in the atoms.

Front

How many protons does nickel (Ni) have?

Back

Nickel (Ni) has 28 protons.

Front

What is the atomic number of sodium (Na)?

Back

The atomic number of sodium (Na) is 11.

Front

What is the significance of the atomic number?

Back

The atomic number indicates the number of protons in an atom and determines the element's identity.

Front

What is the mass number of an atom?

Back

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

Front

How do you find the number of electrons in a neutral atom?

Back

In a neutral atom, the number of electrons equals the number of protons.

Front

What is the periodic law?

Back

The periodic law states that the properties of elements are a periodic function of their atomic numbers.