Question

Which of the following statements are correct? 1. Electrons and protons have identical masses but opposite charges. 2. Most of an atom's mass is concentrated in a small, positively charged, nucleus. 3. Atoms have equal numbers of protons and neutrons. a 1 only b 2 only c 3 only d 1 and 2 only

Answer 1

Only statement 2 is correct: the majority of an atom's mass is concentrated in the small, positively charged nucleus composed of protons and neutrons with similar mass.

Step-by-step explanation:

Of the statements provided regarding atomic structure and properties, the following can be determined:

• Electrons and protons do not have identical masses. The mass of a proton or a neutron is about 1836 times greater than that of an electron.
• Most of an atom's mass is indeed concentrated in a small, positively charged nucleus. This nucleus is composed of protons and neutrons, and protons have a positive charge while neutrons are neutral. As protons and neutrons have approximately the same mass, they contribute significantly to the mass of the atom.
• Atoms do not always have equal numbers of protons and neutrons. The number of neutrons can vary even within atoms of the same element, leading to different isotopes.

Therefore, the correct statement(s) is: 2. Most of an atom's mass is concentrated in a small, positively charged, nucleus.

Answer 2

b 2 only

Step-by-step explanation:

The mass of an electron is 9.10938356 × 10⁻³¹ kilograms while the mass of a proton is 1.6726219 × 10⁻²⁷ kilograms. It can be seen that a proton is heavier than an electron.

Atoms do not always have the same number of neutrons and protons. For, example ¹³C has 6 protons and 7 neutrons.

Atoms do have most of the mass concentrated at the center called the nucleus. The nucleus has protons and neutrons. As protons have positive charge and neutrons have no charge the nucleus has a positive charge.