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How many protons are present in an atom of bromine (Br)?
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2. Atoms & Elements
The Atom
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How many protons and electrons are present in a neutral atom of strontium (Sr)?
A
38 protons and 38 electrons
B
34 protons and 34 electrons
C
36 protons and 36 electrons
D
40 protons and 40 electrons
Guida verificata passo dopo passo1
Identify the atomic number of strontium (Sr) from the periodic table. The atomic number represents the number of protons in the nucleus of an atom.
Recall that in a neutral atom, the number of electrons equals the number of protons to balance the positive charge of the nucleus.
Look up the atomic number of strontium, which is 38. This means a neutral strontium atom has 38 protons.
Since the atom is neutral, it must also have 38 electrons to balance the positive charge of the 38 protons.
Conclude that a neutral atom of strontium contains 38 protons and 38 electrons.
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