Periodic Table Test Review

Which of the following statements are true regarding atomic number, mass number, and atomic mass?

Select TWO correct answers.

• The atomic number is the number of neutrons in the nucleus.

• Isotopes are included in the atomic mass.

• Isotopes are included in the atomic number.

• The mass number is the sum of the element's protons and neutrons.

• The atomic number is the sum of the element's protons and neutrons.

The atomic number is the sum of the element's protons and neutrons.

• sum of protons and neutrons, no isotopes

• Atomic Mass

• quantity of matter in an atom of an elem

• Atomic Mass

• isotopes are included

• Mass Number

• # of protons in the nucleus of an atom

• Atomic Number

The periodic table is a chart representing all of the known elements. Elements in the same group on a periodic table share similar characteristics. Below are three groups from the periodic table, match each group with the characteristic they possess.

• Actinide Series

• Hard with high densities

• Transition Metals

• Radioactive, unstable, many are lab-created

• Lanthanide Series

• Silvery White Soft Metals

Match the following

• atomic mass

• average mass of an element's varied isotopes

• atomic number

• a chart containing information about the elements (atoms) that make up matter

• periodic table

• a substance containing only one type of atom

• element

• the same as the number of protons in its nucleus

A(n) _________ is a physical combination of two or more different substances

• element

• molecule

• compound

• mixture

A(n) _______ is when multiple atoms or molecules of the same type are joined together.

• element

• molecule

• compound

• mixture

In reference to valence electrons and valence shells, what must an atom have to be inert?

• An atom must have no valence electrons in its valence shell.

  
  

• An atom must have less than four valence electrons in its valence shell.

• An atom must have between four and eight valence electrons in its valence shell.

• An atom must have between four and eight valence electrons in its valence shell.

What determines the chemical behavior of an atom?

• The arrangement of electrons in its outermost electron shell.

• The number of electrons in the innermost shell.

• The number of neutrons in the nucleus.

• The presence of valence electrons

Valence electrons are -

• only found in Noble gases.

• found in all atoms, but only when there is an ionic charge.

• electrons in an atom's outermost shell.

• the electrons of an atom, regardless of shell.

A(An)​ ​ (a)   is the name given when atoms (whether identical or different) are joined together by chemical bonds.​

• Element
• Compound
• Mixture
• Molecule