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Subject Test Chemistry

Question 12 of 13

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SAT Subject Test

The set of lettered choices below refers to multiple questions. Select the one lettered choice that best fits each statement or answers each question. A choice may be used once, more than once, or not at all in each set.

Has the same number of electrons as text Ca end text to the power of 2 plus end exponent

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text Ar end text

Correct Answer: 
Yes

text O end text

Correct Answer: 
No

text S end text

Correct Answer: 
No

text Ti end text

Correct Answer: 
No

text U end text

Correct Answer: 
No

The text Ca end text to the power of 2 plus end exponent ion is a text Ca end text atom that has lost two electrons. text Ca end text has an atomic number of 20 and has 20 electrons, so text Ca end text to the power of 2 plus end exponent must have 18 electrons. The neutral atom with 18 electrons (and 18 protons) is text Ar end text. Note that text Ar end text is two elements before text Ca end text in the periodic table.

Question Difficulty: 
medium