What is the chemical symbol for the element with atomic number 1?

• He

• H

• Li

• Be

What color is used to represent metalloids in the periodic table provided in the image?

• Green

• Grey

• Purple

• Blue

What is an atom?

• The largest particle of an element

• The smallest particle of an element that still has the properties of that element

• A combination of elements

• A molecule

Tags

NGSS.MS-PS1-1

What is the simplest form of matter?

• A compound

• A molecule

• An atom

• An element

How many atoms of hydrogen are there in a water molecule (H₂O)?

• 1

• 2

• 3

• 4

Tags

NGSS.MS-PS1-1

Who was the first person to name the atom?

• John Dalton

• Dmitri Mendeleev

• Democritus

• Isaac Newton

What does the word 'atomus' mean in Greek, as used by Democritus?

• Small particle

• Basic unit

• Indivisible

• Invisible

What was John Dalton's model of the atom known as?

• Electron Cloud model

• Solid Sphere model

• Nuclear model

• Planetary model

According to John Dalton's Solid Sphere model, what are compounds?

• Atoms of the same element combined

• Atoms of different elements combined

• Molecules that can't get any smaller

• Elements that are indivisible

Tags

NGSS.MS-PS1-1

Who developed the first periodic table of elements organized by atomic mass?

• Albert Einstein

• Niels Bohr

• Dmitri Mendeleev

• Ernest Rutherford