NURSING EXAM QUESTIONS
BIOCHEMISTRY
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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substance that consists of only one atom
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basic unit of matter
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2 or more elements chemically combined
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None of the above
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Detailed explanation-1: -An atom is the smallest unit of matter that retains all of the chemical properties of an element. For example, a gold coin is simply a very large number of gold atoms molded into the shape of a coin, with small amounts of other, contaminating elements.
Detailed explanation-2: -An atom is a particle of matter that uniquely defines a chemical element. An atom consists of a central nucleus that is surrounded by one or more negatively charged electrons. The nucleus is positively charged and contains one or more relatively heavy particles known as protons and neutrons.
Detailed explanation-3: -The basic building blocks that make up matter are called atoms. What are the different particles found in atoms? (Answer: electrons, protons and neutrons) Where are they found? (Answer: Protons and neutrons are found in the nucleus, and electrons are found in shells around the outside of the nucleus.)