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How is the periodic law demonstrated within the periodic table?

Elements of the periodic table are arranged in order of increasing atomic number. The periodic law states “When elements are arranged in order of increasing atomic number, there is a periodic repetition of their chemical and physical properties.”

Why do halogens Form 1 ions?

Like the alkali metals, the halogens are extremely reactive. They have seven valence electrons, meaning they require only one more electron for a noble configuration. This gives them very large electron affinities and extreme reactivity to form ions with a -1 charge. The halogens exist in diatomic form.

What does the symbol Li+ represent?

Lithium(1+) is a monovalent inorganic cation, a monoatomic monocation and an alkali metal cation….4.3Related Element.

Element Name Lithium
Element Symbol Li
Atomic Number 3

Which are the basic radicals?

State the difference between: acid radical and basic radical

Acid radicals Basic radicals
Acid radicals are formed by removal of hydrogen ion (H+). Basic radicals are formed by the removal of hydroxide ion (OH–).
Example: H2S04 loses one H+ ion to form HSO4– ion. Example: KOH loses OH– ion and becomes K+ ion.

Why are basic radicals divided into groups?

Ksp values of sulphides are low hence precipitated by low [S2-] ion. HCl (with common H+ ion) decreases ionization of H2S which gives low [S2-]. Hence II group is precipitated. Others with higher Ksp values not precipitated.

What is meant by basic radicals?

Basic radical is an ion coming from a base. It is a positively charged chemical species; thus we name it as the cation. Moreover, it is a portion of an inorganic salt. This ion forms as a result of the removal of a hydroxide ion from a base.

How many groups are there in basic radicals?

Group Basic radicals Ppt. as
II Cu2+, Cd2+, Pb2+, Hg2+ (II), Bi3+, As3+, Sb3+, Sn2+ Sulphides (CuS, CdS, PbS, HgS, Bi2S3, As2S3,Sb2S3,SnS)
III Al3+, Cr3+, Fe3+ Hydroxide Al(OH)3, Cr(OH)3, Fe(OH)3
IV Zn2+, Ni2+, Mn2+, Co2+ Sulphides (ZnS, MnS, NiS, CoS)
V Ca2+, Ba2+, Sr2+ Carbonates (CaCO3, BaCO3, SrCO3)

What are the basic radicals belongs to Group IIIA?

In group III, the basic radicals are iron, aluminium and chromium and are precipitated as their hydroxides.

Which group of basic radicals give the flame test?

Sodium. Hint: The basic radical present in the salt which gives a violet colour to the flame is a member of the first group of the periodic table. In other words, the odd element is an alkali metal. It has the atomic number 19.

Why is cobalt glass used in flame test?

Cobalt glass plates are used as an optical filter in flame tests to filter out the undesired strong yellow light emitted by traces of sodium, and expand the ability to see violet and blue hues, similar to didymium glass.