Biology
Biology
10th Edition
ISBN: 9780321794260
Author: Audesirk, Teresa/ Audesirk
Publisher: Pearson College Div
Question
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Chapter 2, Problem 1FIB
Summary Introduction

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.

Expert Solution & Answer
Check Mark

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.

Conclusion

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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