In any atom, the number of electrons present is equal to the number of protons present, and the number of protons is the atomic number. The only case where this would not be true is when you're dealing with an ion, but you aren't so your answer is 7.
Lithium is element #3. That, of course, is the atomic number - the number of protons. The atomic mass will of course depend on the specific isotope. The most common isotope is Lithium-7, that is, atomic mass = 7. Lithium-6 also occurs in nature as a stable isotope.
Rubidium is a metal element. Mass number of it is 85.
The atomic number of an element is the number of protons in the nucleus of each atom of the element. Mass number is a property of a particular isotope of the element rather than of the element itself: The mass number is the sum of the numbers of protons and neutrons in the nucleus of each atom of the isotope.
The element with a mass number of 37 is chlorine (Cl).
The element with a mass number of 52 is Chromium (Cr). It's atomic number is 24.
Lithium is element #3. That, of course, is the atomic number - the number of protons. The atomic mass will of course depend on the specific isotope. The most common isotope is Lithium-7, that is, atomic mass = 7. Lithium-6 also occurs in nature as a stable isotope.
Lithium is an element with an atomic number of 3 and an atomic mass of 7.
Lithium is a metal element. Atomic mass of it is 7.
Nitrogen has a gram atomic mass of 14.0067, an atomic number of 7, and the chemical symbol N.
Nitrogen is a non metal element. Atomic mass of it is 64.
When inspecting the Periodic Table, you will find two number against each element. The smaller number is the Atomic Number and also the number of protons in the element. The larger number is the Atomic Mass , which is the total of all the protons and neutrons in that element. Hence to find the number of neutrons in an element. Subtract Atomic Mass from Atomic Number.= number of neutrons.
Rubidium is a metal element. Mass number of it is 85.
The atomic mass number A is the total number of protons and neutrons in an atom's nucleus. For nitrogen (N), the atomic number (number of protons) is 7. If it has 7 neutrons (designated as "7n"), then the atomic mass number A would be 14 (7 protons + 7 neutrons).
Sodium is a metal element. Mass number of it is 23.
The atomic number of nitrogen is 7. The atomic number represents the number of protons in the nucleus of an atom. The isotope "nitrogen-14" refers to an atom of nitrogen that has 7 protons and 7 neutrons in its nucleus.
The atomic number of element X is determined by the number of protons, which is 7. For the second isotope, which has 10 neutrons, the mass number is the sum of protons and neutrons, calculated as 7 protons + 10 neutrons = 17. Therefore, the second isotope has an atomic number of 7 and a mass number of 17.
The atomic number of an element is the number of protons in the nucleus of each atom of the element. Mass number is a property of a particular isotope of the element rather than of the element itself: The mass number is the sum of the numbers of protons and neutrons in the nucleus of each atom of the isotope.