Multiple Choice
Which of the following is a valid two-letter chemical symbol from the periodic table?
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4. Atoms and Elements
Periodic Table: Element Symbols
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Which element is located in Group 2 and Period 3 of the periodic table?
A
Aluminum (Al)
B
Sodium (Na)
C
Calcium (Ca)
D
Magnesium (Mg)
Verified step by step guidance1
Understand the layout of the periodic table: Groups are the vertical columns numbered from 1 to 18, and Periods are the horizontal rows numbered from 1 to 7.
Identify Group 2, which is known as the alkaline earth metals group. Elements in this group have two valence electrons.
Locate Period 3, which is the third row from the top of the periodic table. This period includes elements with electrons filling up to the third energy level.
Find the element that is in both Group 2 and Period 3 by looking at the intersection of the second column and the third row on the periodic table.
Recognize that the element at this position is Magnesium (Mg), which has the atomic number 12 and fits the criteria of Group 2 and Period 3.
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