The first five ionization energies (IE, through IE,) of a Period 2 element have the following pattern: IE, IE2 IE3 IE4 IE5 Make a reasonable guess about which element this is. Enter its chemical symbol below. kJ/mol

Consider an ionic compound, MX, composed of generic metal M and generic, gaseous halogen X. • The enthalpy of formation of MX is AH; = -513 kJ/mol. • The enthalpy of sublimation of M is AHsub = 123 kJ/mol. • The ionization energy of M is IE = 465 kJ/mol. • The electron affinity of X is AHEA = -325 kJ/mol. (Refer to the hint). • The bond energy of X, is BE = 187 kJ/mol. Determine the lattice energy of MX. AHjattice -795.5 kJ/mol Incorrect

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Which of the following elements is the largest?   a barium b titanium c rubidium d sodium

An atomic anion with a charge of -2 has the following electron configuration: 1s 2s 2p 3s 3p What is the chemical symbol for the ion? W How many electrons does the ion have? How many 2s electrons are in the ion?

what is the elemental form of fluorine? F(g) F- (aq) F+(g) or none of the these?

Write the number of valence electrons in the elements Ca,Si,Kr,S and Na

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The first five ionization energies (IE, through IE,) of a Period 4 element have the following 1 ll IE, IE, IE3 IEĄ IE, Make a reasonable guess about which element this is. Enter its chemical symbol below. kJ/mol