Multiple Choice
Which three elements make up most of Earth's atmosphere?
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2. Atoms & Elements
Periodic Table: Representative Elements & Transition Metals
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How many elements are present in period 6 of the periodic table?
A
36
B
28
C
18
D
32
Verified step by step guidance1
Understand that a period in the periodic table corresponds to a horizontal row, and the number of elements in a period depends on the electron shells being filled in that row.
Recall that period 6 involves filling the 6th electron shell, which includes the 6s, 4f, 5d, and 6p subshells.
Count the number of electrons that can be accommodated in these subshells: 6s can hold 2 electrons, 4f can hold 14 electrons, 5d can hold 10 electrons, and 6p can hold 6 electrons.
Add these numbers together to find the total number of elements in period 6: 2 (6s) + 14 (4f) + 10 (5d) + 6 (6p) = 32 elements.
Therefore, the number of elements in period 6 is 32.
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