What were the first two elements formed during the Big Bang?

Who discovered the neutron of an atom and measured its mass?

In this model, the atom is made up of negative electrons that float in a “soup” of positive charge, much like plums in a pudding or raisins in a fruit cake. Who proposed the plum-pudding model of an atom?

An atom model that described the atom as a tiny, dense, positively charged core called a nucleus surrounded by lighter, negatively charged electrons.

___ are the primary substances that compose all matters in our surroundings.

The number of protons of an atom is called the ___. This number is the same for all atoms of a given element and is unique to that element.

Who discovered the electron of an atom?

What are the three subatomic particles?

Aristotle believed that all substances on Earth were made up of small amount of the four elements of matter. What were these four elements?

Who discovered the nucleus of an atom through his gold foil experiment?

His idea of the atom was that of a particle with no parts and no smaller components.

___ is the smallest particle of an element that retains the characteristics of the element.

What are the two subatomic particles that are tightly packed in the nucleus of an atom?

Atoms of the same element may have different number of neutrons are called ___.

___ is the ability of an atom in a molecule to attract shared electrons.

The force that binds two or more atoms together.

Which statement is NOT true of Bohr's model of the atom?

An atomic model which shows that electrons orbit around a big nucleus.

Which statement about atoms of

elements in the same group of the periodic table is TRUE?