Q&A

Why do we see hydrogen at 2 places in a periodic table?

Why do we see hydrogen at 2 places in a periodic table?

Hydrogen is the smallest and the lightest element and has the first position which is an unique position in the periodic table. Hydrogen behave like alkali metals as well as halogens and that is why, they ‘re placed at the top of the periodic table.

Why there are two elements in the first period of the periodic table hydrogen and helium and eight elements in the second period?

There are only two elements in the first period: hydrogen and helium. This is because in quantum physics, this period fills up the 1s orbital. Period 1 elements follows the duet rule, they only need two electrons to complete their valence shell. These elements can only hold two electrons, both in the 1s orbital.

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Why hydrogen gas Cannot be placed in Group IA and VIIA of the periodic table at least four point for each?

1) Hydrogen is a non-metal where as elements of I-A are metals. 3) Hydrogen cannot lose its valence electron. 4) Hydrogen is a gas at room temperature but alkali metals are solids. 5) Unlike Na+ or K+ hydrogen ion (H+) is unstable in water.

Why has hydrogen been placed in the first group of the periodic table although it is a non metal?

Hydrogen is a non metal but as per the electronic configuration there is the arrangement of the electrons and the elements with one electron in the outer most shell is placed in the 1st group. so hydrogen is also placed for the same.

Why is hydrogen special in the periodic table?

Hydrogen is the first element of the periodic table as its atomic number is one, which means it has only one electron in its atom and thus only one electron is present in its outermost shell.

What is hydrogen in the periodic table?

Hydrogen is known to be the first element in the periodic table of elements. It has one proton in its nucleus and one outter electron. It is a very light gas and also flammable. Its atomic symbol is H and its atomic number is one. Hydrogen; Hydrogen, H, is a chemical element with atomic number 1.

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What period is hydrogen?

Period 1
Fact box

Group 1 Melting point
Period 1 Boiling point
Block s Density (g cm−3)
Atomic number 1 Relative atomic mass
State at 20°C Gas Key isotopes

What elements are in the same period as hydrogen?

Period 1 element

Hydrogen
Lithium Beryllium Oxygen
Sodium Magnesium Sulfur
Potassium Calcium Selenium
Rubidium Strontium Tellurium

What group is hydrogen in on the periodic table?

Group 1
Fact box

Group 1 −259.16°C, −434.49°F, 13.99 K
Block s 0.000082
Atomic number 1 1.008
State at 20°C Gas 1H, 2H
Electron configuration 1s1 133-74-0

Why hydrogen can be placed in group 1 and 17?

The reason why the hydrogen can be placed in both group 1 and group 17 is that it resembles Alkali metals in some of its properties like it can easily form cations so, it can be placed in Group 1 of periodic table but it also resembles Halogens in its properties like it forms which is true property of halogen that is …

Why is hydrogen on top of the periodic table?

Hydrogen is placed above group in the periodic table because it has ns1 electron configuration like the alkali metals. However, it varies greatly from the alkali metals as it forms cations (H+) more reluctantly than the other alkali metals.

Where is hydrogen on the periodic table?

So if you glance at the periodic table, you will see hydrogen is the first element in the table. It is the smallest element on the table. It has atomic number one, which means it has only one electron orbiting it its shell. In fact, Hydrogen has only one shell.

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What is the difference between hydrogen and hydrogen in the periodic table?

1 Answer 1. The two hydrogens are the same, but some periodic tables show hydrogen in both places to emphasize that hydrogen isn’t really a member of the first group or the seventh group. Hydrogen is a diatomic gas in it’s elemental state, which is different from the other group one metals (and similar to the group seven elements).

Why is hydrogen not an electropositive metal?

Loss of Electron: Although it has only one electron in its outer shell, hydrogen cannot easily lose this electron to gain electropositivity. All other alkali metals can do this with ease. State: At room temperatures where all alkali metals exist is the solid state, hydrogen is a gas.

Why is hydrogen not a metalloid?

You’ll always see it in the 1A group. Metalloids show physical and chemical properties of both metals and nonmetals. Hydrogen has no physical properties of a metal and no chemical properties of a non metal. That’s why it isn’t a metalloid.

How many protons electrons and electrons are in hydrogen?

Hydrogen is a chemical element with atomic number 1 which means there are 1 protons and 1 electrons in the atomic structure. The chemical symbol for Hydrogen is H. With a standard atomic weight of circa 1.008, hydrogen is the lightest element on the periodic table.