The temperature of a sample of matter is ameasure of the
(1) average potential energy of the particles of
the sample
(2) average kinetic energy of the particles of the
sample
(3) total nuclear energy of the sample
(4) total thermal energy of the sample

Answer:

nineteen atoms

Explanation:

nineteen atoms

Answer : The density of iron is, 7.8 g/mL

Explanation : Given,

Mass of iron = 4.7 g

Volume of water = 27.10 mL

Volume of water and iron = 27.70 mL

First we have to calculate the volume of iron.

Volume of iron = Volume of water and iron - Volume of water

Volume of iron = 27.70 mL - 27.10 mL

Volume of iron = 0.6 mL

Now we have to calculate the density of iron.

Now put all the given values in this expression, we get:

Thus, the density of iron is, 7.8 g/mL

An electron's exact position cannot be pinpointed is the features of the electron cloud model of an atom. Therefore, option A is correct.

What is an electron cloud model ?

In 1926, Werner Heisenberg and ErwinSchrödinger created the electron cloud model. The model is a tool for aiding in the visualization of the electrons' most likely location within an atom.

The electron cloud model is another name for the contemporary theory. This is due to the fact that each orbital surrounding an atom's nucleus resembles a fuzzily arranged cloud.

According to definition, an electron cloud is the area around the nucleus of an atom where electrons are most likely to be found.

Thus, option A is correct.

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Answer: a

Explanation:

The correct answer is A) They all have similar chemical properties.

Explanation:

In chemistry, the periodic table organizes visually the chemical elements. In this, elements are arranged according to different features. In the case of families of the elements, these refer to elements organized in the same column, for example, elements that are in column 18 form a family called noble gases.

These elements form a family because they have chemical properties; in the case of noble gases, this includes similar reactivity and physical features such as color and odor. Besides this, the elements of one family share a similar electron configuration but not the same number of electrons. This means, from the options given the one that identifies the elements that belong to a family is "They all have similar chemical properties".

Each set of elements has an equal number of electrons in the outer orbital. We refer to these as valence electrons. Each element's chemical characteristics are determined by its valence electrons. The correct option is A.

The elements in the same group or column of the periodic table are those whose chemical characteristics are the most comparable. The vertical groups of elements that have the same number of valence electrons and, consequently, comparable chemical characteristics are formed when the elements are arranged in order of atomic number.

Only when matter changes to become a completely other sort of matter can chemical characteristics be measured or observed. They consist of flammability, reactivity, and rusting potential.

Thus the correct option is A.

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