CaBr2-potassium chloride
Li2O-calcium bromide
Answer:
B. PEA = KEC. +PEC
Explanation:
From the figure it is clear that there is interconversion between potential energy ( PE ) and kinetic energy ( KE ) , so that total mechanical energy is conserved .
At A only potential energy exists . Kinetic energy is zero .
At B only kinetic energy exists . Potential energy is zero .
At C both potential and kinetic energy exist .
So Potential energy at A is equal to potential energy at C and kinetic energy at C
Ie , PEA = KEC + PEC .
Option B is correct .
Answer:
Group 5th A.
Explanation:
The elements of group 5th A shows the electronic configuration of s² p³.
This group consist of nitrogen, phosphorus, arsenic, antimony, bismuth.
Electronic configuration of nitrogen:
N₇ = [He] 2s² 2p³
Electronic configuration of phosphorus
P₁₅ = [Ne] 3s² 3p³
Electronic configuration of arsenic
As₃₃ = [Ar] 3d¹⁰ 4s² 4p³
Electronic configuration of antimony
Sb₅₁ = [Kr] 4d¹⁰ 5s² 5p³
Electronic configuration of bismuth
Bi₈₃ = [Xe] 4f¹⁴ 5d¹⁰ 6s² 6p³
People have thought that everything had went around the earth Our understanding of the universe has changed over time. Different civilizations have created different models to explain what the universe
is and how the universe began. The Greek astronomer Ptolemy
used measurements of the sky to create his geocentric model. This had the earth at the center and all the planets and the sun orbiting around it.