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incorrect. which of the elements have the same number of valence electrons as ca?
in the periodic table, calcium, element 20, is surrounded by elements 12, 19, 21, and 38. which of these have physical and properties most resembling calcium? (more than one answer may be correct.)
sr
sc
k
mg
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hint

Explanation:

Step1: Determine valence electrons

Valence electrons are determined by the group number in the periodic table. Calcium (Ca) is in group 2, so it has 2 valence electrons.

Step2: Analyze each element

• Sr (Strontium): Group 2, has 2 valence electrons.
• Sc (Scandium): Group 3, has 3 valence electrons.
• K (Potassium): Group 1, has 1 valence electron.
• Mg (Magnesium): Group 2, has 2 valence electrons.

Elements in the same group have similar physical and chemical properties due to the same number of valence electrons.

Answer:

Sr, Mg