ASSIGNMENT CHEMIST

What is electronegativity?

• Chemical property that describes the tendency of an atom to attract electrons of covalent bond towards itself

• Atom that have the most electron

• The most stable atom

When moving across a period,

• the attraction between the nucleus and valence electrons are weak.

• less energy are needed to remove an electron

• ionisation energy are increase

• ionisation energy are decrease

Anion are formed when

• their atom receive electron

• the electron remain the same

• the number of shell increase

• the atom donate electron

Attraction between nucleus and electron valence are strong . This may lead in

• increasing of atomic radius

• decreasing of ionisation energy

• increasing of ionic radius

• decreasing of atomic radius

Why atomic radius increase down a group ?

• Number of proton increase, so the attraction between electron and proton are weak

• The number of shell is remaining same, but the number of electron valence are increase

• The screening effect are decrease because the number of electrons increase

• More inner electron and inner shells

' It smaller than its neutral atom '

This statement are suitable for

• Cl^-

• Ca²⁺

• Cl

• K

When across a period , the electronegativity is increase

• TRUE

• FALSE

When going down a group, the attraction between nucleus and valence electron become stronger.

• TRUE

• FALSE

The group of element are determined by

• the valence electron

• the highest principal of quantum number

• the second last of orbital diagram

Why ionic radius for kation is smaller than their atom ?

• The attraction between proton and nucleus are increase

• The number of electron are increase

• electron cloud enlarge

• repulsion between electrons decrease