Number of lone pair present at central atom of I3- ion and also give hybridisation and shape of ion?

I3- is polyhalide ion it is formed due to the presence of vacant d-orbital orbital in Iodine atom. It has Sp3d3 hybridisation and linear structure.

How many maximum atoms of IF7 are present in the same plane ?

IF7​ has Sp3d3 hybridisation and pentagonal bipyramidal structure that means  five Fluorine (F)  atom and one Iodine (I) atom lies at equitorial positions and while other two Fluorine (F) atom lies at axial position .So, total atoms lies in same plane will be six (6)

What is stretching frequency of C-O bond in carbonyl Complexes?

V^co = 1/2πc√k/u

Where u= reduced mass of CO

            k =force constant of CO bond

            C= Velocity of light 

           V^CO = Stretching frequency of CO in carbonyl which increases energy to stretch CO along bond axis.

(1) Stretching frequency of CO is inversely proportional to negative oxidation state of central metal atom

(2) Extent of back bonding or back acceptance is directly proportional to negative oxidation state of central metal atom.

(3) M-C bond order is directly proportional to negative oxidation state of central metal atom

(4) C-O bond order is inversely proportional to negative oxidation state of central metal atom.

(5) d C-O bond length is directly proportional to negative oxidation state of central metal atom.

(6) Bond energy of C-O bond is inversely proportional to negative oxidation state of central metal atom 

What are different stacking pattern of atoms in simple cubic cell (SCC) , body cubic cell (BCC) and face centred cell (FCC) unit lattice cell ?

"AA AA AA...", the letters refer to the repeating order of the layers, starting with the bottom layer.

"AB AB AB ..." Type of stacking pattern present  a in body centred cubic (BCC).The considerable space shown between the spheres is misleading: spheres are closely packed in bcc solids and touch along the body diagonal.

"ABC ABC ABC..." type of stacking pattern is of face centered cubic (fcc) or cubic close packing (ccp) type.

Total numbers of elements which are liquid at normal temperature is ?

Total number of liquid elements in periodic table : 6 (Six): (Ga, Br, Cs, Hg, Fr, Uub):

Related Questions:

(1) What are the Amphoteric metals ? gives Examples.

(2) Name of total metalloids present in periodic table ?

(3) What are the increasing order of molar conductivity of first group elements in water ?

(4) What is Mendeleev's periodic table ? give important features and draw back of Mendeleev's table.

(5) What is atomic density ? give the periodicity of atomic density in periods and groups.

(6) What is atomic volume ? and what is periodicity of atomic volume in groups and periods ?

(7) Why there are 2, 8 and 8 elements in first, second and third periodic of periods table respectively ? Explain.

(8) In alkali metal group which is the strongest reducing agent in aqueous solution and why?

(9) The electron affinity of sulphur is greater than oxygen. Why?

(10) The first ionization energy of carbon atom is greater than that of boron atom, whereas reverse is true for the second ionization energy. Explain.

(11) The electronegativities of B, Al, Ga are 2.0, 1.5, 1.6 respectively. The trend is not regular. Explain.

(12) Li2CO3 decomposes on heating but other alkali metal carbonates don’t. Explain.

(13) Of all noble metals, gold has got a relatively high electron affinity. Explain.

(14 Ionization energy of Boron is smaller than Beryllium even though effective nuclear charge is higher?

(15) What are the increasing order of ioni radii of first group elements in water ?