The reason the Periodic Table was created in the first place was to illustrate the "periodic" physical properties of the known elements of the time. Because of this, the properties of elements that were "missing" from the table could be extrapolated from the periodic trends seen in the known elements.
See "Mendeleev's predicted elements" in Wikipedia The answers are: scandium (Sc - 21), gallium (Ga - 31), technetium (Tc - 43), and germanium (Ge - 32) He temporarily named them to be: ekaboron (Eb), ekaaluminium (El), ekamanganese (Em), and ekasilicon (Es).
At the time the periodic table was first devised, there were many elements that had not yet been discovered. Their existence could be inferred, but they couldn't actually be put into the table until they were discovered.When the periodic table was first devised, there were lots of elements that had not been discovered yet.
There is not one but there are two metalloids in Period 4 of the periodic table. They are germanium and arsenic. There is a link below to the Wikipedia post on the metalloids so you can have a look at them.
they are all in the same group (column) in the Periodic Table
There were 3 blank spaces in mendeleev's Periodic Table. He left it for the elements which were not discovered at that time.
The gaps in the first periodic elements described those elements which were not discovered at that time. Eg-silicon,germanium etc
germanium
Germanium
Mostly Silicon and Germanium.
Germanium
In 1869, a total of 63 elements had been discovered by. A few were gases. Two were liquids. Most were solid metals.
Yes. The elements in the Periodic Table are the only elements that have been discovered. However, we are still discovering and synthesising more elements.
In the Periodic Table, a group is a column of elements and a period is a row. The element in the 14th column and fourth row is germanium.
See "Mendeleev's predicted elements" in Wikipedia The answers are: scandium (Sc - 21), gallium (Ga - 31), technetium (Tc - 43), and germanium (Ge - 32) He temporarily named them to be: ekaboron (Eb), ekaaluminium (El), ekamanganese (Em), and ekasilicon (Es).
At the time the periodic table was first devised, there were many elements that had not yet been discovered. Their existence could be inferred, but they couldn't actually be put into the table until they were discovered.When the periodic table was first devised, there were lots of elements that had not been discovered yet.
Demitri Mendeleev discovered a pattern to the periodic table in 1869.
All of them, the periodic table has all of the elements the human discovered or made..