what is the significance of the number that is written above each of the atomic symbol in the periodic table?

Answers

Answer 1

Answer: It is the atomic number of the element, which is the number of protons in the nucleus of an atom that determines the chemical properties of an element.

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Why do the elements at the bottom of the periodic table have lower ionization energies than their group/family partners at the top of the periodic table?

Any substance composed of two or more elements that are chemically combined in a fixed proportion is(1) an isomer (3) a solution
(2) an isotope (4) a compound

Answers

Any substance composed of two or more elements that are chemically combined in a fixed proportion is known as a Compound. Thus, it's D.

What do you mean by Elements?

Elements may be defined as any substance that cannot be disintegrated into more superficial substances by standard chemical processes.

In chemistry, an isomer may be defined as those molecules which the same molecular formulas, but different arrangements of atoms.

An Isotope may be defined as an atom that bears the same atomic number and chemical identities but possesses a different atomic mass.

A solution may be defined as a homogeneous mixture of one or more solutes disbanded in a specific solvent.

Therefore, the correct option for this question is D.

To learn more about Compounds, refer to the link:

brainly.com/question/26556885

#SPJ2

(4) a compound is the correct answer~

Using the following phase diagram, the area labeled A is in what phase?Solid

Liquid

Gas

Answers

Using the following phase diagram, the area labeled A is in what phase?Using the following phase diagram, the area labeled A is in the liquid phase.

The atomic mass of an element can be approximated by adding the number of _______ plus the average number of _______.A. protons; electrons

B. protons; neutrons

C. neutrons; electrons

Answers

Answer: Option (B) is the correct answer.

Explanation:

Atomic mass is defined as the summation of total number of protons and neutrons present in an element.

On the other hand, atomic number means the total number of protons present in an element.

For example, atomic number of sodium is 11 and number of neutrons present in it are 12.

Hence, atomic mass of sodium = no. of protons + no. of neutrons

= (11 + 12) amu

= 23 amu

Therefore, we can conclude that the atomic mass of an element can be approximated by adding the number of protons plus the average number of neutrons.

by adding number of protons and neutrons

Which traits explain the differences between halogens and alkali metals? Select all that apply Question 5 options: Halogens are better oxidizing agents than their alkali metal counterparts within the same period. Halogens have a larger van der Waal's radii than their alkali metal counterparts within the same period. Halogens have a higher effective nuclear charge than their alkali metal counterparts within the same period. Halogens have a higher first ionization energy than their alkali metal counterparts within the same period. Halogens have a higher electron affinity than their alkali metal counterparts within the same period.

Answers

Answer:

Halogens are better oxidizing agents than their alkali metal counterparts within the same period

Halogens have a higher first ionization energy than their alkali metal counterparts within the same period.

Halogens have a higher electron affinity than their alkali metal counterparts within the same period.

Halogens have a higher effective nuclear charge than their alkali metal counterparts within the same period

Explanation:

Effective nuclear charge increases across a period and accounts for increase in ionization energy across a period. This explains why halogens in the same period with alkali metals have higher effective bucket charge as well as ionization energy than the alkali metals.

Similarly, electron affinity increased across a period, halogens have greater ekctron affinity than corresponding alkali metals in the same period.

The liquid substances mercury (density = 13.6 g/mL), water (1.00 g/mL), and cyclohexane (0.778 g/mL) do not form a solution when mixed; instead, they separate in distinct layers. List how the liquids would position themselves in a test tube. Rank the liquids from the top of the tube to the bottom.

Answers

Answer:

Cyclohexane, water, mercury.

Explanation:

One result of Archimedes' principle is that, in a container, the substance with the highest density will be in the bottom of the container and the substance with the lowest density, will be in the top of the container.

In the test tube with mercury, water and cyclohexane. In the top you will have cyclohexane (Least dense), in the middle will be the water and in the bottom will be mercury.

From the top to the bottom:

Cyclohexane, water, mercury.

Under which conditions will gases best dissolve in liquids?

Answers

Gases best dissolve in liquid under low temperature. This is because when you increase the temperature it will cause an increase in kinetic energy. An increase in kinetic energy means there would be an increase in molecular motion of gas particles. This would cause for gas particles to escape to the gas phase thus making it difficult for it to be dissolved.

Answer:

when the pressure is low and the temperature is low

Explanation:

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An atom is determined to contain 12 protons, 10 electrons, and 12 neutrons. What are the mass number and charge of this atom or ion? Select one: a. mass number: 24, charge: +2 b. mass number: 22, charge: neutral c. mass number: 34, charge: -2 d. mass number: 34, charge: +2

What is the minimum pressure in kPa that must be applied at 25 °C to obtain pure water by reverse osmosis from water that is 0.227 M in sodium chloride and 0.078 M in magnesium sulfate? Assume complete dissociation for electrolytes.

An article about half-lives describes a parent isotope. What is a parent isotope?