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18) An element has the following Ionization Energies (in kJ/mol): IE1 = 786 IE2 = 1,820 IE3 = 2,910 IE4 = 4,560 IE5 = 16,600 IE6 = 20,100 How many valence electrons does the neutral atom have? 19) A sample of copper metal, absorbs 50.0 J of heat, upon which the temperature of the sample increases from 22.0°C to 37.5°C. If the specific heat of copper is 0.385 J/g*K, what is the mass of the sample? 20) What is the valence electron configuration for the element in Period 4, Group 6A?
19)
A sample of copper metal, absorbs 50.0 J of heat, upon which the temperature of the sample increases from 22.0°C to 37.5°C. If the specific heat of copper is 0.385 J/g*K, what is the mass of the sample?
20)
What is the valence electron configuration for the element in Period 4, Group 6A?
Expert Answer
18. Since ionization energy is IE6 , it means that 6 electrons are removed hence it has neutral atom has 6 valence electrons .
20. Element belongs to 4th period and 6A group is Selenium (Se) atomic No =34
And Electronic Configuration is 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p4 or [Ar]3d10 4s2 4p4
Valence shell is 4s2 4p4 and has 6 valence electrons
19. 
