CHS Chemistry semester 1 review

Front

What are valence electrons?

Back

Valence electrons are the electrons in the outermost energy level of an atom.

Front

What state of matter has no definite volume and no definite shape?

Back

Gas.

Front

Which element is represented in a Bohr Model with 3 electrons in the first shell and 1 in the second?

Back

Lithium.

Front

What is the atomic radius trend in the periodic table?

Back

Atomic radius increases down a group and decreases across a period.

Front

Which element has a larger atomic radius: Oxygen (O), Sulfur (S), Tellurium (Te), or Polonium (Po)?

Back

Polonium (Po) has the largest atomic radius.

Front

What is the Bohr model used to represent?

Back

The Bohr model is used to represent the arrangement of electrons in an atom.

Front

What is the charge of a proton?

Back

A proton has a positive charge.

Front

What is the charge of an electron?

Back

An electron has a negative charge.

Front

What is the significance of the atomic number?

Back

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

Front

What is the difference between an element and a compound?

Back

An element is a pure substance made of one type of atom, while a compound is made of two or more different types of atoms chemically bonded together.