Physical Science: E-Exam DL

Match the following terms with their definitions:

• The number of protons in the nucleus of an atom.

• Ion

• A pure substance consisting only of one type of atom.

• Element

• Atoms of the same element that have different numbers of neutrons.

• Mass Number

• The total number of protons and neutrons in an atom's nucleus.

• Isotope

• An atom or molecule with a net electric charge due to the loss or gain of one or more electrons.

• Atomic Number

Fill in the blank: The atomic number of an element is the number of ______ in the nucleus of an atom.

• protons

• neutrons

• electrons

• atoms

Match the following terms with their definitions:

• A neutral particle found in the nucleus of an atom.

• Electron

• The weighted average mass of an atom's isotopes.

• Neutron

• A positively charged particle found in the nucleus of an atom.

• Nucleus

• The central part of an atom, containing protons and neutrons.

• Proton

• A negatively charged particle that orbits the nucleus of an atom.

• Atomic Mass

Fill in the blank: The mass number of an atom is the sum of the number of ______ and ______ in the nucleus.

• protons and neutrons

• electrons and protons

• neutrons and electrons

• protons and electrons

Match the following terms with their definitions:

• The distance from the nucleus to the outermost shell of an atom.

• Valence Electrons

• A vertical column in the periodic table.

• Atomic Radius

• A horizontal row in the periodic table.

• Group

• Electrons in the outermost shell of an atom.

• Period

• The energy required to remove an electron from an atom.

• Ionization Energy

Fill in the blank: The atomic radius of an element is the distance from the nucleus to the ______ of the electron cloud.

• outer edge

• center

• middle

• core

Complete the following: Element: Nitrogen Atomic Number: 7 Mass Number: 14 Protons = ______ Electrons = ______ Neutrons = ______

• Protons = 7, Electrons = 7, Neutrons = 7

• Protons = 7, Electrons = 8, Neutrons = 6

• Protons = 6, Electrons = 6, Neutrons = 8

• Protons = 8, Electrons = 7, Neutrons = 6

Complete the following: Element: Hassium Atomic Number: 108 Mass Number: 277 Protons = ______ Electrons = ______ Neutrons = ______

• Protons = 108, Electrons = 108, Neutrons = 169

• Protons = 108, Electrons = 108, Neutrons = 170

• Protons = 108, Electrons = 107, Neutrons = 169

• Protons = 107, Electrons = 108, Neutrons = 169

Complete the following: Element: Unknown Atomic Number: 118 Mass Number: 294 Protons = ______ Electrons = ______ Neutrons = ______

• Protons = 118, Electrons = 118, Neutrons = 176

• Protons = 118, Electrons = 117, Neutrons = 176

• Protons = 117, Electrons = 118, Neutrons = 177

• Protons = 118, Electrons = 118, Neutrons = 177

Complete the following: Element: Carbon Atomic Number: 6 Mass Number: 12 Protons = ______ Electrons = ______ Neutrons = ______

• Protons = 6, Electrons = 6, Neutrons = 6

• Protons = 6, Electrons = 7, Neutrons = 5

• Protons = 5, Electrons = 6, Neutrons = 7

• Protons = 7, Electrons = 6, Neutrons = 5