Chapter 5 Section 2 Review

In a periodic table, a set of properties repeats from

• element to element
• group to group
• column to column
• row to row

Tags

NGSS.HS-PS1-1

Moving from left to right across a row of the periodic table, which of the following values increases by exactly one from element to element?

• isotope number
• atomic number
• atomic mass unit
• mass number

A column in the periodic table is referred to as a

• group
• period
• stack
• layer

The standard on which the atomic mass unit is based is the mass of a

• proton
• neutron
• chlorine-35 atom
• carbon-12 atom

The atomic mass of an element is

• the sum of the protons and neutrons in one atom of the element.
• twice the number of protons and neutrons in one atom of the element.
• a ratio based on the mass of a carbon-12 atom.
• a weighted average of the masses of the element's isotope.

How is the atomic mass of an element determined?

• Average the atomic masses of all its isotopes
• Use the atomic mass of the most abundant isotope
• Take a weighted average of the masses of the isotopes present in nature.
• Count the number of protons and neutrons in an atom of the elements.

At room temperature, none of the metals are

• soft.
• liquids.
• malleable.
• gases.

Which general statement does NOT apply to metals?

• Most metals are ductile.
• Most metals are malleable.
• Most metals are brittle.
• Most metals are good conductors of electric current.

An isotope of an unknown element has an atomic mass of 8 amu and is found in 10% abundance in nature. A second isotope of the same element has a mass of 10 amu and is found in 90% abundance in nature. What is the atomic mass of this unknown element?

• 9.8 amu
• 9 amu
• 980 amu
• 8100 amu

Which of the following elements is a noble gas?

• Hydrogen

• Nitrogen

• Oxygen

• Helium