Semester Exam A

Front

What is an isotope?

Back

Isotopes are variants of a particular chemical element that have the same number of protons but different numbers of neutrons.

Front

How many protons does potassium have?

Back

Potassium has 19 protons.

Front

Where are the most reactive nonmetals located on the periodic table?

Back

The most reactive nonmetals are found in Group 17 (the halogens).

Front

What type of bond is formed when carbon bonds with hydrogen in methane?

Back

Covalent bond.

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

What is the chemical formula for Sodium Chloride?

Back

NaCl.

Front

What is the difference between ionic and covalent bonds?

Back

Ionic bonds involve the transfer of electrons from one atom to another, while covalent bonds involve the sharing of electrons between atoms.

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 are the main groups of the periodic table?

Back

The main groups are: Group 1 (alkali metals), Group 2 (alkaline earth metals), Groups 3-12 (transition metals), Group 13-18 (main group elements including nonmetals and noble gases).

Front

What is a chemical formula?

Back

A chemical formula is a way of expressing information about the proportions of atoms that constitute a particular chemical compound.