Chemistry Semester 1 Exam

Front

What describes the elements in family (group) 17 on the periodic table?

Back

They have seven valence electrons.

Front

How many protons are in Cadmium?

Back

48

Front

What type of nuclear radiation is emitted when a beta particle is released?

Back

Beta radiation.

Front

What is an isotope?

Back

An isotope is a form of an element that contains the same number of protons but a different number of neutrons.

Front

How does ionization energy change across a period from left to right?

Back

Ionization energy generally increases because the valence electrons are getting closer to the nucleus.

Front

What is the atomic number of an element?

Back

The atomic number is the number of protons in the nucleus of an atom.

Front

What is the significance of valence electrons?

Back

Valence electrons determine how an element reacts chemically with other elements.

Front

What is the difference between an atom and a molecule?

Back

An atom is the smallest unit of an element, while a molecule is a group of two or more atoms bonded together.

Front

What is the periodic law?

Back

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

Front

What is the role of neutrons in an atom?

Back

Neutrons contribute to the mass of an atom and help stabilize the nucleus.