The group that has at least one element in each of the three phases of matter at STP is [tex]\boxed{\left( 3 \right){\text{ }}17}[/tex].
Further Explanation:
The systematic arrangement of various elements in the increasing order of their atomic numbers is termed as the periodic table. It exists in the form of a table, comprising of horizontal rows called periods and vertical columns called groups. There are 18 groups and 7 periods in a periodic table.
(1) Group 1 includes lithium, sodium, potassium, rubidium, cesium and francium. All of these elements are solids. So group 1 elements exist in only one phase of matter.
(2) Group 2 includes beryllium, magnesium, calcium, strontium, barium, and radium. All of these elements are solids. So group 2 elements exist in only one phase of matter.
(3) Group 17 includes fluorine, chlorine, bromine, iodine, and astatine. Out of these elements, F and Cl are gases, bromine is a liquid and iodine and astatine are solids at STP. So the elements of group 17 exist in different phases of matter.
(4) Group 18 includes helium, neon, argon, krypton, xenon, and radon. These are called noble gases as these are chemically inert. All the group 18 elements are gases in nature. So group 18 elements exist in only one phase of matter.
Learn more:
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Answer details:
Grade: High School
Subject: Chemistry
Chapter: Periodic classification of elements
Keywords: elements, group 1, group 2, group 18, group 17, solid, liquid, gas, phases of matter.
