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Elements on the Periodic Table in the same group have the same number of valence electrons. Since valence electrons are the only part of an atom that interacts with other atoms during a chemical reaction, you can make generalizations about elements' reactivity based upon what group they're in. Elements in the same group will behave similarly in chemical reactions even if they bear little resemblance to each other physically.
Wiki User
∙ 11y ago
Wiki User
∙ 15y agoElements are put into groups according to how many valence electrons they have. You'll recall that the valence electrons are the electrons in the outer most shell of an atom. It is the number of valence electrons that generally determine the chemistry of atoms, and that's what the periodic table is all about.
Wiki User
∙ 11y agoThe number of valence electrons.
For instance:
Na is in group 1 so it has one electron in its outermost shell.
Mg is in group 2 so it has 2 electrons in its outermost shell.
Wiki User
∙ 13y agoHas the same number of valence electrons.
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What does an element's mass number tell us?
The mass number tells you the number of Protons and Neutrons in an atomic nucleus.
The atomic number of an element tells the?
atomic number tells us the number of protons and electrons in the given atom. As Atomic No. = no. of protons = No. of electrons
What tells the number of protons in the?
number of protons in the atoms tells us to what chemical element atoms belongs. in other words :different number of protons means different element. also protons together with neutrons make most of the atoms weight.
What does the Roman numeral above the group tell us about the structure 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).
What is the protons of element calcium?
An atom's atomic number tells us how many protons it has. If we reference a periodic table, we see that calcium's atomic number is 20. Thus, calcium has 20 protons.
What does an element's mass number tell us?
The mass number tells you the number of Protons and Neutrons in an atomic nucleus.
How can you find group no?
The number of valence electrons tell us the group number of that element.
What does the group number on the periodic table explain?
The atomic number tells us the number of electrons and the number of protons., i.e. Atomic Number = Number of electrons = Number of Protons. The atomic mass tells the total number of particles in the nucleus, i.e. Atomic Mass = # of protons + number of neutrons. The Group number is the heading at the top of a column in the table. It tells the the outer electron configuration of the atom. This determines many chemical properties of the element.
The atomic number of an element tells the?
atomic number tells us the number of protons and electrons in the given atom. As Atomic No. = no. of protons = No. of electrons
What does the atomic number tell us?
it tells us the number on the periodic table and it also tells us how many protons and nuetrons and electrons are in the atom within the nuecles.
The period on the periodic table tells you what?
The group to which the element belongs and, therefore, its chemical properties.
What does an element's atomic number tell us?
The atomic number is the number of protons that the element has.
What does the formula of a substance tell you?
The formula of a substance(element or compound) tells us the number of molecules in the in the substance(element or compound).
What does a subscript tell us about an element in a compound?
In a molecular formula, the subscript tells us the number of atoms of the element that are present in one molecule of the compound. For instance,H2O tells us that there are two hydrogen and one oxygen atom per molecule of water. As for ionic compounds, it tells us the number of atoms present in one formula unit of the compound.
What tells the number of protons in the?
number of protons in the atoms tells us to what chemical element atoms belongs. in other words :different number of protons means different element. also protons together with neutrons make most of the atoms weight.
What does the period number tell us about the element?
For elements it's the atomic number not the "Period Number." This number tells you how many protons a single atom of that element has in its nucleus. The "period number" is a dimensionless quantity used in fluid dynamics.
What dose the atomic number tells you?
The Atomic Number tells us the position of the element in the Periodic Table. It also tells us the number of protons and electrons in an atom of that element. The Atomic Mass/Weight is different. The Atomic Mass is the total numbers of nucleons ( protons and neutrons) in the nucleus of an atom. For a given element the atomic mass can vary. This is because the nucleus may have a different number of neutrons. These different masses of a given element are named 'Isotopes'.
