Elements Molecules and Compounds

Elements are:

• Unique and cannot be broken down into anything simpler

• Two or more atoms bonded together

• Two or more different atoms bonded together

• Two or more substances physically mixed together

Trail mix is an example of a:

• Element

• compound

• Molecule

• Mixture

Oxygen, Nitrogen, Hydrogen, and Calcium are all examples of ______________________.

• molecules

• compounds

• atoms

• elements

Tags

NGSS.MS-PS1-1

Which one of the following is a compound?

• NaCl

• O₂

• Hydrogen

• He₂

Tags

NGSS.MS-PS1-1

Which of these is only a molecule and not a compound?

• a

• b

• c

• d

Tags

NGSS.MS-PS1-1

Any combination of two or more atoms that are chemically combined is called this.

• molecule

• compound

• element

• pure substance

Tags

NGSS.MS-PS1-1

This is any combination of two or more atoms from different elements that are chemically combined.

• compound

• molecule

• element

• pure substance

Tags

NGSS.MS-PS1-1

These are what form chemical bonds as atoms share or take them from one another. They orbit the nucleus and have a negative charge (but they are still happy about things in general).

• electrons

• electron clouds

• protons

• neutrons

This tells you how many protons are in each atom of a specific element and how many electrons there are in each unreacted atom from that element.

• atomic number

• atomic mass

• chemical formula

• chemical symbol

This is the written out expression for a substance and contains each element in it and the number of atoms for that element.

• chemical formula

• chemical symbol

• The Periodic Table of Elements

• pure substance