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# What does the mass number of an element equal?

## What does the mass number of an element equal?

Together, the number of protons and the number of neutrons determine an element’s mass number: mass number = protons + neutrons. If you want to calculate how many neutrons an atom has, you can simply subtract the number of protons, or atomic number, from the mass number.

## Is atomic mass the same as mass number?

Key Takeaways: Atomic Mass Versus Mass Number The mass number is the sum of the number of protons and neutrons in an atom. It is a whole number. The atomic mass is the average number of protons and neutrons for all natural isotopes of an element. It is a decimal number.

What is the atomic number equal to?

number of protons
The number of protons in a nucleus is called the atomic number and always equals the number of electrons in orbit about that nucleus (in a nonionized atom).

### Which atoms have the same mass number?

Isobars, are the atoms having the same mass number but different atomic number. For example, the atomic number of carbon and nitrogen is 6 and 7 respectively. Carbon-14 an isotope of carbon has a mass number of 14 which is same as that of nitrogen and hence carbon-14 and nitrogen are isobars.

### What is equal in an element?

The number of protons in the nucleus of the atom is equal to the atomic number (Z). The number of electrons in a neutral atom is equal to the number of protons. The mass number of the atom (M) is equal to the sum of the number of protons and neutrons in the nucleus.

Which of the following is equal to the mass number of an element when combine?

The number of protons and the number of neutrons together determine the mass number of an element: mass amount = protons + neutrons.

#### Why is atomic mass equal to molar mass?

Answers. Molar masses of the elements are the same numeric value as the masses of a single atom in atomic mass units but in units of grams instead. Molar masses of compounds are calculated by adding the molar masses of their atoms.

#### What is the mass number of an atom equal to quizlet?

The mass number is equal to the sum of the number of protons and the number of neutrons .

Does atomic mass equal number of protons?

## Which two elements has the same mass number?

Different isotopes of the same element cannot have the same mass number, but isotopes of different elements often do have the same mass number, e.g., carbon-14 (6 protons and 8 neutrons) and nitrogen-14 (7 protons and 7 neutrons).

## Are protons and neutrons equal number?

For most of the 16 lightest elements (up to oxygen) the number of neutrons is equal to the number of protons.

Is molar mass equal to mass number?

That is, the molar mass of a substance is the mass (in grams per mole) of 6.022 × 10 23 atoms, molecules, or formula units of that substance. In each case, the number of grams in 1 mol is the same as the number of atomic mass units that describe the atomic mass, the molecular mass, or the formula mass, respectively.

### Is molar mass is equal to molecular mass?

In chemistry the substance is usually measured using molecular mass and molar mass….Molar mass:

Difference between Molar mass and Molecular mass
Example: Mass of 1 mole of oxygen is 15.9994 grams. Therefore, the molar mass = 15.9994 g/mol Example: Molecular mass of Ca(OH)2 = 74 atomic mass units

### Are protons and neutrons equal in mass?

The mass of a neutron is slightly greater than the mass of a proton, which is 1 atomic mass unit (amu). (An atomic mass unit equals about 1.67×10−27 kilograms.) A neutron also has about the same diameter as a proton, or 1.7×10−15 meters.

What is a mass number quizlet?

Mass Number. Is the sum of the protons plus the number of neutrons in the nucleus. Neutrons add mass to an atom but do not change the atomic number. The mass of a proton is the same as a neutron. The number of Protons in an atom..

#### Are isotopes the same element?

Isotopes are atoms of the same element that have different numbers of neutrons but the same number of protons and electrons. The difference in the number of neutrons between the various isotopes of an element means that the various isotopes have different masses.

#### Does neutrons equal mass?

The mass number of the atom (M) is equal to the sum of the number of protons and neutrons in the nucleus.

Is atomic mass is equal to mass of proton mass of neutron?

## What is the mass number of an element equal to?

Mass number: The mass number of an element is equal to the sum of the number of protons and neutrons. Let’s practice identifying the mass number of an element with the next two examples. What is the mass number for a strontium atom that contains 50 neutrons?

## Which element has a negative charge and a negligible mass?

B) An electron has a negative charge and a mass of approximately 1 amu. C) A neutron has no charge and its mass is negligible. D) A proton has a positive charge and a negligible mass.

Which particle has a positive charge and a mass of 1?

E) A neutron has a positive charge and a mass of approximately 1 amu. A proton has a positive charge and a mass of approximately 1 amu. Nice work! You just studied 38 terms! Now up your study game with Learn mode. Which of the following descriptions of a subatomic particle is correct?

### What is the mass of a proton in Amu?

A proton has a positive charge and a mass of approximately 1 amu. Nice work! You just studied 38 terms! Now up your study game with Learn mode. Which of the following descriptions of a subatomic particle is correct?