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A strontium atom differs from a strontium ion in that the atom has a greater:
A. mass number.
B. atomic number.
C. number of protons.
D. number of electrons.
Strontium has 2 valence electrons in its outer shell. It is easier to lose these 2 electrons than it is to gain 6 more electrons. Losing 2 electrons will give the strontium ion a charge of +2. Ions are charged atoms. An neutral atom has no charge because it has the same number of protons and electrons. An ion can have more or less electrons than an atom of the same element does. A strontium atom would have 2 more electrons than a strontium ion.
 
 
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JPlantesMD
JPlantesMD
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I wrote the MCAT about 8 years ago. During that time I created a whole lot of study material for myself and my friends. I want to now share it with the world. Good luck :)
 
 
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While these questions do not fit the MCAT format (they have no related reading passages) they cover concepts one should understand in order to do well in the physical sciences portion of the MCAT.
Taken: 1,121 times
Added: 7/2/2008
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