In 1869 Russian chemist DIMITRI MENDELEEV started the development of the periodic table,arranging chemical elements by atomic mass. He predicted the discovery of other elements and left spaces open in his periodic table for them. HOPE THIS HELPSS HAVE A GREAT DAY <333
The transitions which fall to the lowest principle position release the greatest energies. In this case, this would be the transition from the 5p to the 3s orbital (a Paschen transition).
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Answer:
0.75 cal/g°c
Explanation:
for specific heat we have formula:
Amount of heat absorbed or released = mass x specific heat of a substance x change in temperature.
ΔQ=m x c x ΔT
where c= specific heat
m= mass of a substance
ΔT = total temperature
ΔQ = Amount of heat
so for specific heat,
c= ΔQ/mxΔT
c= 280/25x (25-10)
c= 280/375
c= 0.75 cal/g°c
Answer: Communicable diseases, abuse gunshot wounds and forensic medicine
Explanation:
Answer : The isoelectronic groups are:
Explanation :
Isoelectronic : It is defined as the compound or molecule having the same number of electrons and the same number of electronic structure.
- The element is helium. The number of electrons are 2.
- The element is beryllium. The number of electrons are 4. The number of electrons in = 4 - 2 = 2
- The element is lithium. The number of electrons are 3. The number of electrons in = 3 - 1 = 2
- The element is nitrogen. The number of electrons are 7. The number of electrons in = 7 + 3 = 10
- The element is neon. The number of electrons are 10.
- The element is sulfur. The number of electrons are 16. The number of electrons in = 16 + 2 = 18
- The element is magnesium. The number of electrons are 12. The number of electrons in = 12 - 2 = 10
- The element is titanium. The number of electrons are 22. The number of electrons in = 22 - 4 = 18
- The element is potassium. The number of electrons are 19. The number of electrons in = 19 - 1 = 18
The isoelectronic groups are: