Atomic Structure Review

Match the Following

• The smallest unit of an element that keeps the element’s chemical properties.

• Element

• Particles with a neutral charge found in the nucleus of an atom.

• Proton

• The dense center of an atom containing protons and neutrons.

• Nucleus

• Positively charged particles found in the nucleus of an atom.

• Neutron

• A substance that cannot be broken down into simpler substances by chemical means.

• Atom

Tags

NGSS.MS-PS1-1

Match the following

• A substance formed from two or more atoms chemically united in fixed proportions.

• Electron

• A negatively charged subatomic particle located around the nucleus of an atom.

• Electron Shell

• The electrons filling the outermost shell; react with other atoms.

• Valence Electron

• Areas around the nucleus filled with electrons. 

• Molecule

• A group of atoms held together by chemical forces.

• Compound

Tags

NGSS.MS-PS1-1

Match the following

• Horizontal rows of elements that have the same number of electron shells. 

• Family/Group

• All known elements arranged in order by atomic number.

• Metal

• Elements that are malleable, ductile, and good conductors; typically shiny.

• Periodic Table

• Vertical columns of elements that have the same amount of valence electrons.

• Atomic Mass/Mass Number

• The average number of protons and neutrons in one atom of an element.

• Period

Match the following

• An element that has properties that fall between metals and nonmetals.

•  Nonmetal

• Elements that are brittle, poor conductors, and have low melting and boiling points.

• Noble Gas

• Elements in group 18 that have very low reactivity.

• Metalloid

Using a periodic table (you can use the one in the textbook) order the following elements by mass number, least to greatest.

• Gallium

• Boron

• Radon

• Hydrogen

• Thallium

Using a periodic table (you can use the one in the textbook) order the following elements by # of Electron Shells, least to greatest.

• Calcium

• Dubnium

• Strontium

• Sodium

• Barium

Using a periodic table (you can use the one in the textbook) order the following elements by # of valence electrons, least to greatest.

• Barium

• Neon

• Oxygen

• Potassium

• Carbon

How many electron shells does the pictured atom have?

• 1

• 2

• 3

• 4

Tags

NGSS.MS-PS1-1

How many valence electrons does the pictured atom have?

• 20

• 3

• 2

• 4

Tags

NGSS.MS-PS1-1

Which one appears least on the periodic table?

• Metals

• Metalloids

• Non-Metals