Atomic Structure

Which category of elements is represented by the color dark blue in the periodic table provided?

• Nonmetals

• Metalloids

• Transition Metals

• Noble gases

Which of the following elements is represented as a liquid at room temperature on this periodic table?

• Helium (He)

• Carbon (C)

• Mercury (Hg)

• Neon (Ne)

What is an atom?

• The smallest particle of an element that has lost the properties of that element.

• The largest particle of an element that still has the properties of that element.

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

• A molecule consisting of two or more elements.

Tags

NGSS.MS-PS1-1

What is an element in terms of matter?

• A compound made of two or more atoms.

• The simplest form of matter.

• A mixture of different types of atoms.

• A type of molecule.

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

• 2 atoms of hydrogen and 2 atoms of oxygen.

• 1 atom of hydrogen and 2 atoms of oxygen.

• 2 atoms of hydrogen and 1 atom of oxygen.

• 3 atoms of hydrogen and 1 atom of oxygen.

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?

• Small particle

• Indivisible

• Compound

• Sphere

What was the main idea behind John Dalton's Solid Sphere model proposed in 1803?

• Atoms are divisible into smaller particles

• Atoms are solid spheres that can't get any smaller

• Atoms are organized by atomic mass

• Atoms are always in motion

According to John Dalton, what are elements made of?

• Atoms that can vary in mass

• Compounds of different elements

• Atoms that all have the same mass

• Indivisible particles

What significant contribution did Dmitri Mendeleev make to the field of chemistry in 1869?

• He discovered the electron

• He created the first periodic table of elements

• He proposed the Solid Sphere model

• He named the atom