Introduction:
Matter is any substance found in the universe which has mass and occupies space. All matter is composed of atoms which are small particles and difficult to study because of their size.
Answer to Problem 1FIB
Correct Answer:
An atom consists of an atomic nucleus composed of positively charged protons and uncharged neutrons. The number of positively charged particles in the nucleus determines the atomic number of the element. Orbiting around the nucleus are electrons that occupy confined spaces called electron shells.
Explanation of Solution
An atom is the smallest unit of element. Atoms are composed of subatomic particles such as electrons, neutrons. and protons. Neutrons carry no charge while protons carry a positive charge and electrons carry a negative charge. The total number of protons present in the nucleus of an atom is called an atomic number. This feature defines each element, making it different from all others. Electrons occupy complex 3-D (dimensional) regions called electron shells around the nucleus. Each shell can hold a specific number of electrons.
Atom is the smallest unit of an element. It composed of subatomic particles such as electrons (negative charge), neutrons (no charge) and protons (positive charge).
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