What is an atom?

• a positively charged particle located in an atom's nucleus

• a vertical column in the Periodic Table. Elements in groups have similar properties.

• the smallest particle of an element that has the chemical properties of that element

Tags

NGSS.MS-PS1-1

What is the atomic mass?

• The average mass of the atoms of an element

• The ability of an object to transfer heat or electricity to another object.

• A particle found within the nucleus that has no electric charge

Tags

NGSS.MS-PS1-5

What does the term 'atomic number' refer to?

• A change of one substance into another substance

• A vertical column in the Periodic Table. Elements in groups have similar properties.

• The total number of protons in an atom's nucleus

What is a chemical change?

• A change of one substance into another substance

• Elements organized by atomic number and shows patterns in their properties

• When a substance remains the same

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

What is a chemical formula?

• An expression that shows the number and types of atoms joined in a compound

• A vertical column in the Periodic Table. Elements in groups have similar properties.

• Elements organized by atomic number and shows patterns in their properties

Tags

NGSS.MS-PS1-1

What is a chemical reaction?

• A liquid's resistance to flow

• The process by which chemical changes occur. Atoms are rearranged and chemical bonds are broken and reformed.

• A positively charged particle located in an atom's nucleus

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

What is the definition of density?

• The smallest particle of an element that has the chemical properties of that element.

• The degree of compactness of a substance.

• A substance that cannot be broken down into a simpler substance by ordinary chemical changes. An element consists of atoms of only one type.

What is an electron?

• A group of atoms that are held together by bonds so that they move as a unit. They can be of the same type or different atoms.

• When a substance remains the same

• The negatively charged particle located outside of the atom's nucleus. It is also the smallest subatomic particle.

Tags

NGSS.MS-PS2-3

What is an element?

• The ability of an object to transfer heat or electricity to another object.

• The total number of protons in an atom's nucleus.

• A substance that cannot be broken down into a simpler substance by ordinary chemical changes. An element consists of atoms of only one type.

What is a group in the context of the Periodic Table?

• A vertical column in the Periodic Table. Elements in groups have similar properties.

• When a substance remains the same

• The central region of an atom where most of the atom's mass is found in protons and neutrons