Elements

What does the atomic number represent?

• the number of protons and usually electrons too

• the number of protons and neutrons

• the number of neutrons

The mass of an atom come from the...

• electrons

• nucleus

• protons

• empty space

Which of the following is the best description of an element?

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

• A naturally occurring mineral made of more than one substance.

• A small particle made with a specific chemical composition.

• A collection of atoms that have different abilities when joined together.

Provided is a list of five different substances.

NaOH     Cu    H2O     N2    H2

How many of these substances are elements?

• 2

• 3

• 4

• 5

Which element is one of the most abundant in both solid parts of Earth and in living matter?

• Carbon

• Oxygen

• Nitrogen

• Phosphorus

Which element makes up most of Earth's atmosphere?

• Hydrogen

• Carbon

• Oxygen

• Nitrogen

Below is a list of some substances and their symbols.

Oxygen O

Sodium Chloride NaCl

Gold Au

Neon Ne

How many of these substances are an example of an element?

• 1

• 2

• 3

• 4

How are elements and compounds different?

• A compound is represented by a chemical formula, and elements are represented by a chemical symbol.

• Compounds are represented by chemical symbols of one letter, and elements are represented by symbols of two letters.

• Elements are pure substances, and compounds are not.

• Elements are always larger units of matter, and compounds are smaller.

How many elements are in the compound Fe₂O₃?

• 0

• 1

• 2

• 3

Tags

NGSS.MS-PS1-1

Which 'sphere' has oxygen and nitrogen as its two main elements?

• Lithosphere

• Biosphere

• Atmosphere

• Hydrosphere