Multiple Choice
Which change occurs when a barium atom loses two electrons?
1
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2. Atoms & Elements
Ions
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What is the charge on a sodium ion (Na^+)?
A
-1
B
0
C
+1
D
+2
Verified step by step guidance1
Understand that the charge on an ion is indicated by the superscript next to the element symbol. For example, Na^+ means sodium has a positive charge.
Recall that a neutral sodium atom has 11 protons and 11 electrons, so its net charge is zero.
When sodium forms an ion, it loses one electron, resulting in 11 protons but only 10 electrons.
Since protons are positively charged and electrons are negatively charged, losing one electron means the ion has one more positive charge than negative charges.
Therefore, the charge on the sodium ion (Na^+) is +1.
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