Unit 1: Atomic Structure and Properties

An atom has an atomic number of 2. Which of the following elements is made from this atom?

• Hydrogen

• Lithium

• Helium

• Beryllium

Tags

NGSS.MS-PS1-1

What is the definition of an element?

• An element is a substance made of only one type of atom.

• An element is made of many different types of atoms.

• An element is made of one or more types of atoms.

• An element contains only protons and neutrons.

Where are neutrons located in an atom?

• In the electron shells

• In the nucleus

What are the three subatomic particles called?

• Protons, nucleus and electrons

• Protons, neutrons and electronic particles

• Particles, neutrons and electrons

• Protons, neutrons and electrons

An atom has an atomic number of 25 and a mass number of 55. How many neutrons does it contain?

• 35

• 30

• 25

• 20

What is the definition of an isotope?

• Isotopes have the same atomic number and different mass numbers.

• Isotopes have different atomic numbers and the same mass numbers.

• Isotopes have equal numbers of protons and neutrons.

• Isotopes have the same number of protons but a different number of neutrons.

Elements in the same group in the periodic table have the same:

• valency

• number of electron shells

• number of neutrons

• number of protons

Which three elements are in the same period?

• Lithium, beryllium and chlorine

• Aluminium, sulfur and krypton

• Gold, silver and francium

• Boron, carbon and fluorine

Elements in the same groups have:

• different chemical properties

• the same boiling points

• similar chemical properties

• the same atomic number

Aluminium has an electron arrangement of 2,8,3. This means that it has:

• 2 electrons in its outer electron shell

• 8 electrons in its outer electron shell

• 3 electrons in its outer electron shell

• 13 electrons in its outer electron shell

Tags

NGSS.MS-PS1-1