## Chemistry 9th Edition

Published by Cengage Learning

# Chapter 2 - Atoms, Molecules, and Ions - Exercises: 56

#### Answer

a) 17 - Chlorine - Halogen b) 4 - Beryllium - Alkaline earth metal c) 63 - Europium - Lanthanide metal d) 72 - Hafnium - Transition metal e) 2 -Helium - Noble gas f) 92 - Uranium - Actinide metal g) 55 - Caesium - Alkali metals.

#### Work Step by Step

For names of the elements, refer to the periodic table. $\Longrightarrow$The 38 elements in groups 3 through 12 of the periodic table are called "transition metals." $\Longrightarrow$Any of the elements beryllium, magnesium, calcium, strontium, barium, and radium, occupying Group IIA (2) of the periodic table are called Alkaline earth metals. $\Longrightarrow$The Alkali metals are a group 1 (Except Hydrogen) in the periodic table consisting of the chemical elements lithium (Li), sodium (Na), potassium (K), rubidium (Rb), cesium (Cs), and francium (Fr). $\Longrightarrow$Any of the gaseous elements helium, neon, argon, krypton, xenon, and radon, occupying Group 18 of the periodic table are called noble gases. $\Longrightarrow$Any of the elements fluorine, chlorine, bromine, iodine, and astatine, occupying group VIIA (17) of the periodic table are called halogens. $\Longrightarrow$Any of the series of fifteen metallic elements from lanthanum to lutetium in the periodic table (atomic numbers 57–71). $\Longrightarrow$Any of the series of fifteen metallic elements from actinium (atomic number 89) to lawrencium (atomic number 103) in the periodic table.

After you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.