hydrogen
alkaline metal group(or the group 1 elements, except for hydrogen(H), which is a group 1 element but not an alkali metal) - lithium (Li), sodium (Na), potassium (K), rubidium (Rb), caesium (Cs), and francium (Fr).
Lithium is in the second period and the first group in the Periodic Table of Mendeleev.
Yes. Mendeleev did group elements in similar properties.
The Halogens. Other elements in this group are Fluorine, Chlorine, Bromine and Astatine.
Chemistry books say that he grouped the elements by atomic weight. That is not the same as density.
alkaline metal group(or the group 1 elements, except for hydrogen(H), which is a group 1 element but not an alkali metal) - lithium (Li), sodium (Na), potassium (K), rubidium (Rb), caesium (Cs), and francium (Fr).
Lithium is in the second period and the first group in the Periodic Table of Mendeleev.
The atomic number of lithium is 3. Lithium is in the second period and the first group in the periodic table of Mendeleev.
Alkali metals, group 1 in the periodic table of Mendeleev.
Yes. Mendeleev did group elements in similar properties.
Alkali metals, group 1 in the periodic table of Mendeleev.
The first group of the periodic table of Mendeleev (alkali metals) contain lithium, sodium, potassium, rubidium, caesium and francium.
"Family of elements" is the synonym of group (column) in the periodic table of Mendeleev.
It is true.
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The Halogens. Other elements in this group are Fluorine, Chlorine, Bromine and Astatine.
Alkali metals. Hydrogen, lithium, sodium, potassium, rubidium, caesium, and francium.