Atomic number is the number of protons. Atomic mass is (mostly) the sum of the masses of the protons and neutrons (more or less).
Atomic number: number of protons in a nucleus unique to an element Atomic mass number: number of protons + number of neutrons in a nucleus. May be a small range of values for a given element. Very roughly the atomic mass number is double the atomic number. For large elements it is more than double.
sodium has more protons and neutrons. electrons have practically no mass, valence electrons are just outer orbital electrons. sodium has 11 protons, 11 electrons, and 12 neutrons. Mass is 23. neon has 10 protons, 10 electrons, and 10 neutrons. Mass is just 20. The neon atom has 10 protons and 10 neutrons for a mass number of 20. The sodium atom has 11 protons and 12 neutrons for a mass number of 23. The number of valence electrons has no bearing on mass number or atomic weight.
The atomic mass is the sum of the number of protons and neutrons in the nucleus because protons and neutrons have a mass of approximately 1 atomic mass unit each. Electrons are much lighter and do not significantly contribute to the overall mass of the atom.
Atomic number is the number of protons in the nucleus of an atom. The mass number however is the sum of the protons and neutrons in the nucleus of an atom. Each element has one specific atomic number (= no. of protons), but can have more different number of neutrons, hence it might have different mass numbers, those atoms are called 'isotopes' of an element. Examples are given below Calcium: Ca(40) has 20 protons and 20 neutrons (mass no. 40) Ca(41) has 20 protons and 21 neutrons (mass no. 41) Kalium: K(40) has 19 protons and 21 neutrons (mass no. 40) K(41) has 19 protons and 22 neutrons (mass no. 41)
Atomic number is the number of protons. Atomic mass is (mostly) the sum of the masses of the protons and neutrons (more or less).
No, it isn't. The mass of an electron is significantly smaller than that of a proton.The mass of 1,800 electrons is about the same as the mass of one single proton.The antiparticle of the electron, the positron, has the same mass as the electron.the mass of the electron is not the same to the mass of the proton
Atomic number: number of protons in a nucleus unique to an element Atomic mass number: number of protons + number of neutrons in a nucleus. May be a small range of values for a given element. Very roughly the atomic mass number is double the atomic number. For large elements it is more than double.
The atomic number is 21: The mass number is the sum of protons and neutrons, while the atomic number is the number of protons, designated n. From the statement of the problem, n+n+3 = 45, or 2n = 42, or n=21.
sodium has more protons and neutrons. electrons have practically no mass, valence electrons are just outer orbital electrons. sodium has 11 protons, 11 electrons, and 12 neutrons. Mass is 23. neon has 10 protons, 10 electrons, and 10 neutrons. Mass is just 20. The neon atom has 10 protons and 10 neutrons for a mass number of 20. The sodium atom has 11 protons and 12 neutrons for a mass number of 23. The number of valence electrons has no bearing on mass number or atomic weight.
No, The atomic mass is the number of protons plus the number of neutrons (the mass of the atom's nucleus). Note that the atomic mass is therefore different in cases where there are different isotopes of the element (because the nucleus will have a different number of neutrons for each isotope). The atomic number is the number of protons (or electrons in the atom's neutral state).
It changes the element! More protons more positive charge!
The atomic mass is the sum of the number of protons and neutrons in the nucleus because protons and neutrons have a mass of approximately 1 atomic mass unit each. Electrons are much lighter and do not significantly contribute to the overall mass of the atom.
number of neutrons = Atomic Mass - atomic numberRead more: How_do_you_calculate_the_number_of_protons_neutrons_and_electrons_in_a_neutral_atom
The mass number is a whole number, but the atomic mass may not be. Mass numbers are the total number of neutrons and protons in an isotope (different from atomic numbers, which are the whole numbers of protons only). These are also whole numbers, and for most lithium, it is 7. The mass number is 6 for lithium-6, which has only 3 neutrons. However, the "atomic mass" of an element is measured in atomic mass units, which are 1/12 of the weight of a carbon-12 atom (6 protons and 6 neutrons). Since neutrons are slightly heavier than protons, and there are more neutrons than protons in lithium-7 (3 protons to 4 neutrons), the atomic mass is slightly more than 7.
The number of protons and neutrons in the nucleus of an atom determines its mass. Elements with more protons and neutrons are more massive. Additionally, the mass of an element can be influenced by the presence of isotopes, which have varying numbers of neutrons.
Atomic number is the number of protons in the nucleus of an atom. The mass number however is the sum of the protons and neutrons in the nucleus of an atom. Each element has one specific atomic number (= no. of protons), but can have more different number of neutrons, hence it might have different mass numbers, those atoms are called 'isotopes' of an element. Examples are given below Calcium: Ca(40) has 20 protons and 20 neutrons (mass no. 40) Ca(41) has 20 protons and 21 neutrons (mass no. 41) Kalium: K(40) has 19 protons and 21 neutrons (mass no. 40) K(41) has 19 protons and 22 neutrons (mass no. 41)