Chemistry Midterm 12/23: Atoms and the Periodic Table

Front

What is an element?

Back

An element is a pure substance that cannot be broken down into simpler substances by chemical means. It consists of atoms that all have the same number of protons.

Front

Which of the following is an example of an element?

Back

Oxygen (O) is an example of an element.

Front

What are the negatively charged particles in an atom called?

Back

Electrons are the negatively charged particles found outside the nucleus of an atom.

Front

What does the number of electrons in an atom indicate?

Back

The number of electrons in an atom indicates its charge and helps determine its chemical properties.

Front

What are groups in the periodic table?

Back

Groups are the vertical columns in the periodic table that contain elements with similar chemical properties.

Front

What are periods in the periodic table?

Back

Periods are the horizontal rows in the periodic table that represent the energy levels of the electrons in the atoms.

Front

How can elements be identified?

Back

Elements can be identified by their atomic number, which is the number of protons in the nucleus of an atom.

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 significance of the atomic mass of an element?

Back

The atomic mass is the weighted average mass of an element's isotopes and reflects the number of protons and neutrons in the nucleus.

Front

What is a neutron?

Back

A neutron is a neutral particle found in the nucleus of an atom, contributing to the atomic mass but not affecting the charge.