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Chapter 2: Problem 56

In the periodic table, how many elements are found in each of the following? a. the halogen family b. the alkali family c. the lanthanide series

Short Answer

Expert verified
a. The halogen family has 5 elements. b. The alkali family has 6 elements. c. The lanthanide series has 15 elements.

Step by step solution

01

Identify the halogen family in the periodic table

The halogen family consists of elements of Group 17 in the periodic table. They are characterized by having seven valence electrons. In this group, there are five elements, including fluorine (F), chlorine (Cl), bromine (Br), iodine (I), and astatine (At).
02

Count the elements in the halogen family

We can count the number of elements in the halogen family, which is 5 elements. The answer for (a) is 5 elements.
03

Identify the alkali family in the periodic table

The alkali family consists of elements in Group 1 of the periodic table, excluding hydrogen. They possess one valence electron and are highly reactive. The alkali family has six elements, including lithium (Li), sodium (Na), potassium (K), rubidium (Rb), cesium (Cs), and francium (Fr).
04

Count the elements in the alkali family

We can count the number of elements in the alkali family, which is 6 elements. The answer for (b) is 6 elements.
05

Identify the lanthanide series in the periodic table

The lanthanide series consists of 15 elements located in the f-block of the periodic table (elements with atomic numbers 57-71). They are also called rare earth elements and include elements like lanthanum (La), cerium (Ce), and neodymium (Nd), among others.
06

Count the elements in the lanthanide series

We can count the number of elements in the lanthanide series, which is 15 elements. The answer for (c) is 15 elements. Final Answers: a. The halogen family has 5 elements. b. The alkali family has 6 elements. c. The lanthanide series has 15 elements.

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