Chemistry High School

Modern atomic theory states that the atom is a diffuse cloud of ________ surrounding a small, dense nucleus.
A) electron
B) neutron
C) proton
D) quark

Answers

Answer 1

Answer:

Electron.

Explanation:

According to modern atomic theory, the electron position is not considered to be discrete  or fix. We say that there is probability of finding electron in particular area around the nucleus. so this we call as that atom is a diffuse cloud of electrons surrounding a small dense nucleus.

The electron density is maximum in shells.

Answer 2
Final answer:

The modern atomic theory states that the atom is a diffuse cloud of electrons surrounding a small, dense nucleus.

Explanation:

The correct answer is (A) electron.

Modern atomic theory states that the atom is a diffuse cloud of electrons surrounding a small, dense nucleus. The electrons are negatively charged particles that orbit the nucleus in specific energy levels or shells. This model of the atom was proposed by Niels Bohr in 1913 and is known as the Bohr model.

For example, in a hydrogen atom, there is one electron orbiting the nucleus. In oxygen, there are eight electrons arranged in two energy levels, with two in the first level and six in the second level.

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Related Questions

How many protons (p) and neutrons (n) are in an atom of magnesium-26?

Answers

Well first of all, we know that the atomic mass of magnesium is 26 due to the fact that it is stated. We can then go to the periodic table and find the atomic number of magnesium, which is 12. We then subtract, 26 - 12 = 14. 

Protons - 12
Neutrons - 14
Final answer:

An atom of magnesium-26 has 12 protons and 14 neutrons. The number of protons is determined by the atomic number of magnesium (12). The number of neutrons is calculated by subtracting the atomic number from the mass number (26 - 12 = 14).

Explanation:

For an atom of magnesium-26 (26Mg), you need to understand its atomic structure. The atomic number of magnesium is 12, which states that a magnesium atom always contains 12 protons in its nucleus. This number defines the identity of an element and is always constant.

Magnesium-26 refers to an isotope of magnesium, where 26 represents the mass number. The mass number is the addition of the protons (p) and the neutrons (n) in an atom. In the case of magnesium-26, we already know there are 12 protons. Subtract the atomic number (number of protons) from the mass number to get the number of neutrons. That is, 26 - 12 = 14 neutrons.

So, an atom of magnesium-26 (26Mg) has 12 protons and 14 neutrons.

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What must be done to be sure a chemical change has taken place?

Answers

The only way is to check the composition.

Hope this helps

What happens to the amount of hydrogen bonding between water molecules as water is heated up?

Answers

The amount of hydrogen bonding increases 

The hydrogen bonds are completely destroyed and their number reduces in a particular volume of water as water molecules are heated up.

What are the hydrogen bonds of water?

The interactions between neighbouring molecules of water containing one hydrogen and two oxygen atoms are the hydrogen bonds of water.

In all its 3 states, water has totally different chemical characteristics. This is due to hydrogen bonding between molecules of water. In a liquid state, hydrogen bonds are constantly formed and broken due to high kinetic energy. The kinetic energy is high due to the moderately high temperature of liquid water.

When the temperature of the water is raised further, the kinetic energy of the molecules of water will also increase. At a high value of kinetic energy, the speed of motion of water molecules will also be extremely high resulting in the breaking of hydrogen bonds.

At a particular increase in the temperature, all the hydrogen bonds between the water molecules will be broken and water will turn to steam. This temperature is called the boiling point of water.

Therefore, the hydrogen bonds are broken and their amount is reduced when the temperature of the water is increased.

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