26. Name or state the following with reference to the elements of the first three periods of the periodic table :-
a. The noble gas having duplet arrangement of electrons-
b. The noble gas having an electronic configuration of 2,8,8 -
c. A metalloid in period 2 and period 3 -
d. The number of electron shells in elements of period 1, period 2 and period 3 -
e. The valency of elements in group 1 -
f. The group whose elements have zero valency -
g. An alkaline earth metal in period 3 -
h. The nonmetallic element present in period 3 other than sulphur and chlorine -
i. An electrovalent compound formed between an alkali metal and a halogen -
j. A covalent compound formed between an element in period 1 and a halogen-
k. An alkali metal in period 3 which dissolves in water giving a strong alkali -
l. The typical elements of periods 2 and periods 3 of group 14, 16b and 17-
m. The bridge elements of period 3 of group 1 , 2 and 13 -
n. The periods which contain the inner transition elements –
Answers
- Helium is the gas having a duplet arrangement of electrons.
- Argon as its atomic no. is 18.
- The metalloid present in periods 2 and 3 are Boron and Silicon respectively.
- In the periodic table, there are 2 electrons in period 1, while both periods 2 and 3 have 8 electrons in the filled level. For atoms with atomic numbers less than about 20, the octet rule of electron addition and orbital filling applies.
- The valency of an element is determined by the number of outer shell (valence) electrons. ... All elements in group 1 have 1 valence electron so they have a valency of +1 as they will tend to give up 1 electron. This is the same for group 2 which will give up two electrons and group 3 which will give up 3 electron .
- The group with valency zero is known as noble group. Noble gases like krypton, argon, neon, xenon, helium and radon are noble gases and come under noble group.
- The elements in the alkaline earth metals group; beryllium (Be), magnesium (Mg), calcium (Ca), strontium (Sr), barium (Ba), and radium (Ra), have two electrons in their outer electronic shell.
- The elements in the alkaline earth metals group; beryllium (Be), magnesium (Mg), calcium (Ca), strontium (Sr), barium (Ba), and radium (Ra), have two electrons in their outer electronic shell.
- rubidium floride.
- It's HCL....formed with hydrogen and chlorine by covalent bond.
- The alkali metal in period 3 is sodium. It dissolves in water to give a strong alkali NaOH.
- Idk.
- Magnesium.
- Period 6 and 7 and grp 3 of periodic table contains the inner transition elements. An inner transition metal (ITM) is one of a group of chemical elements on the periodic table. They are normally shown in two rows below all the other elements. They include elements 57-71 (lanthanides) and 89-103 (actinides).
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Answer:Helium is the gas having a duplet arrangement of electrons.
Argon as its atomic no. is 18.
The metalloid present in periods 2 and 3 are Boron and Silicon respectively.
In the periodic table, there are 2 electrons in period 1, while both periods 2 and 3 have 8 electrons in the filled level. For atoms with atomic numbers less than about 20, the octet rule of electron addition and orbital filling applies.
The valency of an element is determined by the number of outer shell (valence) electrons. ... All elements in group 1 have 1 valence electron so they have a valency of +1 as they will tend to give up 1 electron. This is the same for group 2 which will give up two electrons and group 3 which will give up 3 electron .
The group with valency zero is known as noble group. Noble gases like krypton, argon, neon, xenon, helium and radon are noble gases and come under noble group.
The elements in the alkaline earth metals group; beryllium (Be), magnesium (Mg), calcium (Ca), strontium (Sr), barium (Ba), and radium (Ra), have two electrons in their outer electronic shell.
The elements in the alkaline earth metals group; beryllium (Be), magnesium (Mg), calcium (Ca), strontium (Sr), barium (Ba), and radium (Ra), have two electrons in their outer electronic shell.
rubidium floride.
It's HCL....formed with hydrogen and chlorine by covalent bond.
The alkali metal in period 3 is sodium. It dissolves in water to give a strong alkali NaOH.
Idk.
Magnesium.
Period 6 and 7 and grp 3 of periodic table contains the inner transition elements. An inner transition metal (ITM) is one of a group of chemical elements on the periodic table. They are normally shown in two rows below all the other elements. They include elements 57-71 (lanthanides) and 89-103 (actinides).
Explanation: