SCIENCE
PHYSICAL SCIENCES
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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the same number of neutrons as protons in the nucleus
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the same number of electrons and neutrons
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the same number of protons as electrons
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an even number of energy levels (orbitals)
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Detailed explanation-1: -Atoms are neutral; they contain the same number of protons as electrons. By definition, an ion is an electrically charged particle produced by either removing electrons from a neutral atom to give a positive ion or adding electrons to a neutral atom to give a negative ion.
Detailed explanation-2: -The number of electrons on a neutral atom is equal to the number of protons in the nucleus of the atom. This is known as the atomic number, Z. The removal or addition of electrons to a neutral atom creates ions that have a net negative or positive charge.
Detailed explanation-3: -So in a neutral atom, it is not necessary that protons and neutrons are equal in number. So this statement is false.
Detailed explanation-4: -That means that there must be a balance between the positively charged protons and the negatively charged electrons. Atoms must have equal numbers of protons and electrons. In our example, an atom of krypton must contain 36 electrons since it contains 36 protons.