Question

a pure substance that consists entirely of 1 type of atom is an......
atom
element
ion
isotope
which are elements on the periodic table?
water
fire
neon
nitrogen
lead
which element is mostly in the air we breath??
hydrogen
carbon
nitrogen
oxygen

Explanation:

• A pure substance made of only one - type of atom is defined as an element.
• Neon, nitrogen, and lead are elements listed on the periodic table as they are pure substances with a single - type of atom. Water is a compound (H₂O) and fire is a chemical reaction, not elements.
• Nitrogen makes up about 78% of the air we breathe.

Answer:

• First question: B. element
• Second question: C. neon, D. nitrogen, E. lead
• Third question: C. nitrogen