SCIENCE
CHEMISTRY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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groups, families
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groups, periods
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periods, groups
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families, groups
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Detailed explanation-1: -The elements are arranged in seven horizontal rows, called periods or series, and 18 vertical columns, called groups.
Detailed explanation-2: -basis of periodic table. The horizontal rows of the periodic table are called periods. Each period corresponds to the successive occupation of the orbitals in a valence shell of the atom, with the long periods corresponding to the occupation of the orbitals of a d subshell.
Detailed explanation-3: -Group vs Period Groups are the columns of the periodic table, and periods are the rows. There are 18 groups, and there are 7 periods plus the lanthanides and actinides.
Detailed explanation-4: -A period in the periodic table is a row of chemical elements. All elements in a row have the same number of electron shells. Each next element in a period has one more proton and is less metallic than its predecessor.