What is the atomic mass unit?
An atomic mass unit is defined as a mass equal to one twelfth the mass of an atom of carbon-12. The mass of any isotope of any element is expressed in relation to the carbon-12 standard. For example, one atom of helium-4 has a mass of 4.0026amu. An atom of sulfur-32 has a mass of 31.972amu.
What is the definition of atomic mass Class 9?
Atomic mass in an atom or group of an atom is the sum of the masses of protons, neutrons and electrons. The electrons have very less mass in comparison to protons or neutrons so the mass of electrons is not influenced in the calculation.
What is atomic mass class 11?
Atomic mass of an element is the number of times one atom of the element is heavier than of a atom. Atomic mass of an element is represented by a.m.u. (atomic mass unit). For example, magnesium atom ( ) has a mass equal to 24 a.m.u.
What is atomic mass class 10?
Atomic mass can be defined as the total mass of one atom of any given element. The unit of atomic mass is called the unified atomic mass unit (denoted by ‘u’). Most of the atomic mass of a substance is made up of protons and neutrons. Therefore, it is almost equal to its mass number.
What is atomic mass unit class 12?
An atomic mass unit is defined as accurately 1/12 the mass of a carbon-12 atom. The carbon-12 atom has six neutrons and six protons in its nucleus. It is represented as a.m.u or u (unified). It is a unit of mass used to express atomic masses.
What is atomic mass unit Wikipedia?
Instead, atomic mass is expressed in unified atomic mass units (unit symbol: u). 1 atomic mass unit is defined as 1/12 of the mass of a single carbon-12 atom. 1 u has a value of 1.660 539 066 60(50) × 10−27 kg. A carbon-12 atom has a mass of 12 u.
What is the atomic mass simple answer?
A property closely related to an atom’s mass number is its atomic mass. The atomic mass of a single atom is simply its total mass and is typically expressed in atomic mass units or amu. By definition, an atom of carbon with six neutrons, carbon-12, has an atomic mass of 12 amu.