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Solved problems for the chapter:

Atomic Model

View the theory »

Atomic Structure

1. Elements

1.1. Periodic table of elements

2. Weight and dimensions

3. Forum

↓ Show theory [1] ↓

Detailed solution steps are available at:

https://en.openprof.com/wb/chapter:atomic_model/3655/

Example 1.

A bismuth atom (Bi) has 126 neutrons in its nucleus.

What is the mass number of a bismuth (Bi) atom?
How many electrons are in a neutral bismuth atom?

Example 2.

What are the main components of an electrically neutral atom?

The components of the atom are (select the correct answers):

electron
proton
positron
ion
isotope
neutron

Calculate the number of electrons, protons and neutrons in a gallium atom .

The periodic table of elements states the chlorine symbol as .

State the amounts of elementary particles that make up the chlorine atom.
What else can you learn about the composition of an atom if you know that chlorine is in the seventh group and the third period?

In the periodic table, the element potassium has the designation . Calculate the number of basic particles in the potassium ion .

Using the Periodic Table of Elements, determine:

the numbers of the basic components,
the name

of the element .

The crystal structure of polonium at room temperature is simple cubic. Assume that the polonium atoms are spherical in nature and the radius of a polonium atom is 168 pm, what is the density of a polonium atom?

Which of the following statements is/are correct:

Electrons are carriers of negative charge.
The elementary charge is .
A body is negatively charged when it has an excess of electrons.
Conductors can be charged by touching another charged body.
Insulators can be charged with influenza.

10.

Answer the following questions:

Which unit do we measure electric charge with?
What is the size of the base charge?
Write the charge of the electron and proton.
What is the charge of an electrically neutral atom and why?

11.

How can we charge electrical insulators? Explain what happens during the process and where the charge accumulates?

12.

Answer the following questions:

What does it mean that the body is charged?
When is the body charged negatively and positively?

13.

By what property do we distinguish between electrical conductors and insulators? List some typical electrical conductors and insulators .

14.

We rub an electrically neutral metal rod against the negatively charged jacket. In doing so, 8,500 electrons pass to the rod. What is the charge on the rod?

15.

How can we charge electrical conductors? What happens during the procedure?

16.

We rub an electrically neutral balloon against a wool jacket. The charge accumulates on the balloon. Did the balloon receive or transmit the electrons? How many electrons passed between the bodies?