Question

Based on the representation, which of the following statements about the element is true ?

Answer 1

We generally represent an element by its symbol. provided with the atomic number and mass number or atomic mass

Atomic number is the number of protons present in an element. It is constant for an element.

The mass number of element is the sum of number of protons and number of neutrons

The atomic mass is the total mass of all the protons and neutrons present in the element (in its nucleus).

the number of electrons is equal to number of protons in a neutral atom of element.

The mass of electrons is not included in the total atomic mass of element as it is very low.

So here

12 = it is the number of protons = atomic number of element.

The true statements are

The combined mass of protons and neutrons is 24.305

Answer 2

Answer:

The true statements are “The combined mass of protons and neutrons is 24.305”

Explanation:

First, each element is represented in the periodic table by its symbol, which in this case is the Na symbol belonging to sodium.

Each chemical element is characterized by the number of protons in its nucleus, which is called the atomic number Z. But in the nucleus of each element it is also possible to find neutrons, the number of which can vary. The atomic mass (A) is obtained by adding the number of protons and neutrons of a given nucleus.

Usually, the atomic number Z is in the upper left or right corner of the element box. It is always an integer.

The isotopes of an element are those in which their atomic numbers are equal, but the number of neutrons is different, that is, the number of mass or atomic mass directly. The same chemical element can consist of different atoms, that is, different isotopes. Then, the atomic mass of an element is the weighted average mass of its natural isotopes. The weighted average means that not all isotopes have the same percentage. In other words, the atomic masses of the chemical elements are generally calculated as the weighted average of the masses of the different isotopes of each element taking into account the relative abundance of each of them. Therefore, the atomic mass of an element is not an integer.

The atomic mass can be found under the element symbol.

Knowing that the mass number is indicative of the different isotopes of a chemical element (where the number of protons is identical for all atoms of the element, and the number of neutrons in the nucleus varies, changing the mass number and indicating which isotope of the element is) and considering that the atomic mass of an element is the average mass of the different elements of an element, it is possible to say that the atomic mass of each element indicates the sum of neutrons and protons present in the nucleus of the atom.

Taking into account everything stated above, it is possible to say that the true statements are “The combined mass of protons and neutrons is 24.305”