What does mass number tell you?

protons
An element’s or isotope’s mass number tells how many protons and neutrons in its atoms.

What is the mass number number?

mass number, in nuclear physics, the sum of the numbers of protons and neutrons present in the nucleus of an atom.

What are examples of mass number?

The total number of protons and neutrons in the nucleus of an atom. For example, nitrogen has 7 protons and 7 neutrons in its nucleus, giving it a mass number of 14. Isotopes of elements are distinguished by their mass number; for example, carbon-12 and carbon-14 have mass numbers of 12 and 14 respectively.

Where do I find the mass number?

Together, the number of protons and the number of neutrons determine an element’s mass number: mass number = protons + neutrons.

What is the mass number of lithium?

6.941 u
Lithium/Atomic mass

What have you noticed to the mass number of elements?

Consider the element helium. Its atomic number is 2, so it has two protons in its nucleus. Its nucleus also contains two neutrons. Since 2 + 2 = 4, we know that the mass number of the helium atom is 4.
…
Mass Number.
Name Beryllium
Symbol Be
Atomic Number 4
Protons 4
Neutrons 5

What is the mass number of C 12?

Carbon-12
General
Isotope mass 12 u
Spin 0
Excess energy 0± 0 keV
Binding energy 92161.753± 0.014 keV

Why is mass number always a whole number?

It is also called atomic mass number or nucleon number. Different isotopes of the same element have different mass numbers because their nuclei contain different numbers of neutrons. … The mass number is always a whole number; because it is a count of the particles.

What is the unit for mass number?

atomic mass units
The mass number gives an estimate of the isotopic mass measured in atomic mass units (u). For 12C, the isotopic mass is exactly 12, since the atomic mass unit is defined as 1/12 of the mass of 12C. For other isotopes, the isotopic mass is usually within 0.1 u of the mass number.

What is the mass of chlorine?

35.453 u
Chlorine/Atomic mass

What is the difference between 12C and 13C?

12C has 6 neutrons, 13C has 7 neutrons, and 14C has 8 neutrons and so on.

What called 14C?

Carbon-14 (14C) is a long-lived radio-isotope of Carbon. Carbon-14 is called a cosmogenic nuclide, because it is created by energetic cosmic rays impacting matter in a fission reaction, called spallation. half-life (λ) 5,730y.

What is the mass of Na?

22.989769 u
Sodium/Atomic mass

What is the mass of oxygen?

15.999 u
Oxygen/Atomic mass

What is the mass number of aluminum?

26.981539 u
Aluminium/Atomic mass

What is the mass number of copper?

63.546 u
Copper/Atomic mass

What is the mass number of bromine?

79.904 u
Bromine/Atomic mass

What is the mass of magnesium?

24.305 u
Magnesium/Atomic mass

What’s the mass number of zinc?

65.38 u
Zinc/Atomic mass

What is the mass number of gold?

196.96657 u
Gold/Atomic mass

What is the mass no of zinc?

65.4u
Zinc
Atomic Mass 65.4u
Electron Configuration [Ar]4s23d10
Oxidation States +2
Year Discovered 1746