Chadwick did!
Hope this helps!
Answer:
The energy for 1 mole of these photons is E = 31 × 
Explanation:
Given data
Wavelength 
639.8 × 
m
Plank constant h = 6.626 × 
J sec
Speed of light c = 3 × 
meter per second
We know that Energy of a photon is given by
Value of ( h c ) = 6.626 × × 3 × = 19.878 × 
639.8 × m
Now Energy of a photon
E = 0.031 × 
Joule per mole
E = 31 ×
Therefore the energy for 1 mole of these photons is E = 31 ×
Answer:
you know it is what it is☠
Explanation:
Nonmetallic elements form ions by valence electrons to complete their outer shell. The valence electrons an element has in its outer shell, the easier it is to complete. The electron shells an element has, the easier it is to fill its outermost shell.
Answer:
A chemical reaction rearranges the constituent atoms of the reactants to create different substances as products. The properties of the products are different from those of the reactants.
I hope this helps.
We have to know how urbanization causes pollution.
The reason is: People in urban areas consume more energy, food, and water.
Urbanisation is one of the major problem towards pollution. The smoke from automobiles, factories and power generators make air unhealthy. Also chemical spills and other toxic gases contaminate in air.
The mixing of toxins in the soil is polluting soil which disturbs eco-system.
The high density population in urban area consume more energy , food and water which causes pollution.
