Atoms, Elements, Molecules and Compounds

Hydrogen is a pure substance represented by the chemical symbol H. Which of the following best describes hydrogen?

• Hydrogen is an element made of two or more kinds of atoms.
• Hydrogen is a compound made of only one kind of atom.
• Hydrogen is a compound made of two or more kinds of atoms.
• Hydrogen is an element made of only one kind of atom.

Tags

NGSS.MS-PS1-1

The element oxygen, represented by the symbol O, is classified as

• a pure substance
• a compound
• a mixture
• a solution

Tags

NGSS.MS-PS1-1

What is a compound?

• an atom with more electrons than protons

• a substance in which the atoms of two or more elements are combined together

• an atom with more neutrons than protons

• a substance in which there is only one element present.

Atoms combine to form _______. 

• electrons
• molecules
• nuclei
• neutrons

Tags

NGSS.MS-PS1-1

Where are protons and neutrons located? 

• in the nucleus
• in the electron cloud
• in the valence shell

Tags

NGSS.MS-PS1-1

What is the charge on a proton? 

• positive
• neutral
• negative

What is the charge of an electron? 

• positive
• neutral
• negative

Tags

NGSS.MS-PS2-3

What is the proton?

• a negatively charged particle that orbits the nucleus

• a neutral particle found in the nucleus

• a positively charged particle found in the nucleus

• a neutral particle that orbits the nucleus

What is the electron?

• a negatively charged particle that orbits the nucleus

• a neutral particle found in the nucleus

• a positively charged particle found in the nucleus

• a neutral particle that orbits the nucleus

What is the neutron?

• a negatively charged particle that orbits the nucleus

• a neutral particle found in the nucleus

• a positively charged particle found in the nucleus

• a neutral particle that orbits the nucleus