Exam 2: Atoms, molecules, and Ions

Aluminum reacts with a certain nonmetallic element to form a compound with the general formula Al₂X₃.Element X must be from Group ________ of the Periodic Table of Elements.

The correct name for H₂SO₃ is ________.

Which metal does not form cations of differing charges?

Which element forms an ion with the same charge as the sulfate ion?

Which of the following elements is a nonmetal?

In the periodic table,the elements touching the steplike line are known as ________.

The correct name for Na₃N is sodium azide.

A molecule of water contains hydrogen and oxygen in a 1:8 ratio by mass.This is a statement of ________.

An atom of the most common isotope of gold, Au,has ________ protons,________ neutrons,and ________ electrons.

What is the correct formula for ammonium sulfide?

An atom of 13_{C contains ________ protons.}

The correct name of the compound Na₃N is ________.

The element calcium is in a group known as the ________.

How many total electrons are in the Li⁺ ion?

Methane and ethane are both made up of carbon and hydrogen.In methane,there are 12.0 g of carbon for every 4.00 g of hydrogen,a ratio of 3:1 by mass.In ethane,there are 24.0 g of carbon for every 6.00 g of hydrogen,a ratio of 4:1 by mass.This is an illustration of the law of ________.

________-rays consist of fast-moving electrons.

If an atom gains 3 electrons to make an ion,what is the charge on that ion?

The element X has three naturally occurring isotopes.The masses (amu)and % abundances of the isotopes are given in the table below.The average atomic mass of the element is ________ amu.

The element X has three naturally occurring isotopes.The masses (amu)and % abundances of the isotopes are given in the table below.The average atomic mass of the element is ________ amu.

The name of the ionic compound NaBrO₄ is ________.