The first twenty elements are made up f different things
In the Periodic Table of Elements there are: 118 Observed Elements 114 Officially Discovered Elements 112 Officially named Elements 92 Naturally Occuring Elements 83 Non-radioactive elements
Group 1 elements are called alkali metals and all have a single electron in their outer shell/valence shell. These alkali metals are: Lithium (Li) Sodium (Na) Potassium (K) Rb (Rubidium) Caesium (Cs) Francium (Fr)
When looked at the periodic table its u will see that each column has a # on the top of the periodic table...group 1 is the 1st column to the left & are the alkaline metals...the last column all the way to the right of periodic table are nobel gases..for example. Transition metals are all the elements in groups # 3-12. (In between where the metals & the non metals locations on the P.T). Hope that helps!
Helium (He) has the highest ionization energy.
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Nitrogen can be found in the 1st period of group 15 elements in the periodic table.
Because the properties of the elements change in a periodic fashion. In the early versions, when fewer elements were known, the chemically similar elements were thought to occur every eight positions.
In the Periodic Table of Elements there are: 118 Observed Elements 114 Officially Discovered Elements 112 Officially named Elements 92 Naturally Occuring Elements 83 Non-radioactive elements
All except neon and helium
He created the first periodic table of elements, arranged by atomic mass. His greatest accomplishment, however, was his ability to predict missing elements using this periodic table, and that is why he is considered the Father of the Periodic Table of Elements.
The elements of the 1st GROUP of the periodic table are called alkali metals. The elements of the 17th GROUP of the periodic table are called halogens. Alkali metals are soft metals whereas halogens are non-metals.
hydrogen is an element of the periodic table and has the symbol H. hydrogen has 1 electron and is 1st on the periodic table.
When looked at the Periodic Table its u will see that each column has a # on the top of the periodic table...group 1 is the 1st column to the left & are the alkaline metals...the last column all the way to the right of periodic table are nobel gases..for example. Transition metals are all the elements in groups # 3-12. (In between where the metals & the non metals locations on the P.T). Hope that helps!
elements 56 through 71 are called the lanthanoids
Group 1 elements are called alkali metals and all have a single electron in their outer shell/valence shell. These alkali metals are: Lithium (Li) Sodium (Na) Potassium (K) Rb (Rubidium) Caesium (Cs) Francium (Fr)
Potassium has the largest atomic radius. It is in the 1st group of the periodic table. Fluorine has the least atomic radius.
The periodic table orders elements by its number of protons. The 1st element has 1 proton, the 2nd has 2, and so on. Furthermore, elements with similar characteristics are grouped vertically. These elements(1A-8A) have the same number of electrons in their outer shell, so react similary. Elements organized horizontally have progressively more protons and electrons.