A group (also known as a family) is a vertical column in the periodic table of the chemical elements and the group number tells you what group it is in.
The group or family of an element in the periodic table tells us about the number of valence electrons an atom of that element has. This can provide information about the atom's reactivity and chemical properties. Different groups have similar characteristics due to their similar outer electron configurations.
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Valence electrons are the outermost electrons in an atom's electron cloud, and they determine the atom's chemical properties. The number of valence electrons influences how likely an atom is to form chemical bonds with other atoms. Elements with the same number of valence electrons tend to exhibit similar chemical behavior.
The atomic number is the number of protons in an atom's nucleus.
The number of protons in the nucleus of an atom tell you which element you are dealing with. It is the number of protons in an atomic nucleus that determines the elemental identity. Only that. The atomic number of an element is the number of protons you will find in the nucleus of every atom of that element, regardless of the number of neutrons or electrons involved.
The group number of an atom in the periodic table tells you the number of valence electrons that atom has. Valence electrons are involved in the atom's chemical reactions and determine its chemical properties. Atoms in the same group have similar chemical behaviors due to having the same number of valence electrons.
Tell you the number of protons and electrons in an atom
the atomic number is the number of protons/electrons in the atom
the atomic number is the number of protons/electrons in the atom
The mass number tells us the number (the sum) of protons and neutrons in the nucleus of an atom.
It would tell you how many neutrons make up the Nucleus of the atom.
The mass number of an atom is equal to the sum of its number of protons and neutrons, simply, nucleons.
The mass number of an atom is equal to the sum of its number of protons and neutrons, simply, nucleons.
It would tell you how many neutrons make up the Nucleus of the atom.
If you are referring to GROUP NUMBER when you say "Roman numeral above the group", it tells you the number of valence electrons, or the number of outermost electrons, with transition metals being the exception. For group number XII - XVIII the number of valence electrons is the group number minus 10 (minus 10 for the 10 transition groups).
The group or family of an element in the periodic table tells us about the number of valence electrons an atom of that element has. This can provide information about the atom's reactivity and chemical properties. Different groups have similar characteristics due to their similar outer electron configurations.
If the number of protons and neutrons are the same, its an atom, if not its an ion