Question

section 4.2 the structure of an atom wed. oct 8 (pages 108 - 112) this section compares the properties of three subatomic particles. it also discusses atomic numbers, mass numbers, and isotopes. reading strategy (page 108) monitoring your understanding before you read, list in the table shown what you know about atoms and what you would like to learn. after you read, list what you have learned. for more information on this reading strategy, see the reading and study skills in the skills and reference handbook at the end of your textbook. what i know about atoms what i would like to learn what i have learned most students will know that atoms are the “building blocks” of matter, and some may know that atoms contain subatomic particles. based on the title of the section, students may say that they want to learn more about the structure of atoms. properties of subatomic particles (pages 108 - 109) 1. what are three subatomic particles? a. __________ b. ________ c. __________ 2. circle the letter that identifies a subatomic particle with a positive charge. a. nucleus b. proton c. neutron comparing subatomic particles (pages 109 - 110) 3. circle the letters of properties that vary among subatomic particles. a. color b. location in the atom c. charge 4. circle the letter of the expression that accurately compares the masses of neutrons and protons. a. mass of 1 neutron = mass of 1 proton b. mass of 2000 neutrons = mass of 1 proton c. mass of 1 electron = mass of 1 proton

Explanation:

Step1: Recall sub - atomic particles

Protons, neutrons, and electrons are the three sub - atomic particles.

Step2: Identify positively charged particle

A proton has a positive charge. The nucleus is not a sub - atomic particle by itself, it contains protons and neutrons. Neutrons are neutral.

Step3: Determine varying properties

Sub - atomic particles vary in location in the atom (protons and neutrons in the nucleus, electrons in the electron cloud) and charge (protons + 1, neutrons 0, electrons - 1). They do not have color.

Step4: Compare masses

The mass of 1 neutron is approximately equal to the mass of 1 proton. Electrons have much less mass than protons.

Answer:

1. a. Proton; b. Neutron; c. Electron
2. b. proton
3. b. location in the atom; c. charge
4. a. mass of 1 neutron = mass of 1 proton