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How many elements exist as gases at room temperature (approximately 25°C and 1 atm)?
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2. Atoms & Elements
The Atom
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Which element has a neutral atom containing 17 electrons?
A
Phosphorus
B
Chlorine
C
Sodium
D
Oxygen
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Recall that a neutral atom has an equal number of protons and electrons.
Identify the atomic number of each element, which equals the number of protons (and electrons in a neutral atom).
Phosphorus has atomic number 15, so it has 15 electrons in a neutral atom.
Chlorine has atomic number 17, so it has 17 electrons in a neutral atom.
Sodium has atomic number 11, and Oxygen has atomic number 8, so neither has 17 electrons.
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