Quiz on Atomic Structure

The charge of a proton is (a)  

• Negative

• Neutral

• Positive
• No charge

Answer explanation

The charge of a proton is positive. Protons are one of the fundamental particles in an atom, and they carry a positive electric charge, which is essential for the structure of atoms and the formation of matter.

Tags

NGSS.MS-PS2-5

Where are protons found in an atom?

• In the electron cloud

• In the nucleus

• In the outer shell

• In the energy levels

Answer explanation

Protons are positively charged particles found in the nucleus of an atom, which is the central part of the atom. The other options refer to locations where electrons are found, not protons.

What is the charge of an electron?

• Positive

• Neutral

• Negative

• No charge

Answer explanation

The charge of an electron is negative, which distinguishes it from protons that have a positive charge and neutrons that are neutral. Therefore, the correct answer is negative.

Tags

NGSS.MS-PS2-3

What is the charge of the nucleus in an atom?

• Negative

• Neutral

• Positive

• No charge

Answer explanation

The nucleus of an atom is composed of protons and neutrons. Protons carry a positive charge, while neutrons are neutral. Therefore, the overall charge of the nucleus is positive.

The significance of the atomic number is that it determines the number of (a)  

• It determines the number of neutron

• It determines the number of electro

• It determines the number of protons

• It determines the energy levels

Answer explanation

The atomic number is defined as the number of protons in an atom's nucleus. This is crucial because it determines the element's identity and its position in the periodic table, making 'It determines the number of protons' the correct choice.

In the Bohr Model, electrons (a)   the nucleus in energy levels.

• They are stationary in the nucleus

• They orbit the nucleus in energy le

• They determine the atomic number

• They have a positive charge

Answer explanation

In the Bohr Model, electrons orbit the nucleus in defined energy levels, which distinguishes this model from earlier atomic theories. This explains why the correct choice is 'They orbit the nucleus in energy le'.

What is the maximum number of electrons the 2nd energy level can hold in a Bohr diagram?

• 2 electrons

• 8 electrons

• 18 electrons

• 10 electrons

Answer explanation

In a Bohr diagram, the maximum number of electrons in the 2nd energy level is determined by the formula 2n², where n is the energy level. For n=2, 2(2)² = 8 electrons. Therefore, the correct answer is 8 electrons.

Match the following energy levels with the number of electrons they can hold:

• 1st energy level

• 10 electrons

• 4th energy level (d-subshell)

• 8 electrons

• 2nd energy level

• 2 electrons

• 3rd energy level

• 18 electrons

Where can you find the atomic mass in the element diagram?

• On the left side of the element

• On the right side of the element

• At the bottom of the element

• In the middle of the element

Answer explanation

The atomic mass of an element is typically found on the right side of the element in the periodic table. This placement helps distinguish it from other information, such as the element's symbol and atomic number, which are usually on the left.

What does the symbol in the middle of the element diagram represent?

• Atomic number

• Atomic mass

• Element symbol

• Element name

Answer explanation

The symbol in the middle of the element diagram represents the element symbol, which is a one- or two-letter abbreviation of the element's name. It is distinct from the atomic number and atomic mass, which are also part of the diagram.