Question

> Question 17 3.5 pts Which of the following elements has the lowest ionization energy? O AI O Ne O Ca ОСІ o Ba Next < Previous D Question 18 3.5 pts Which of the following atoms has the most metallic character? O Rb O Na O Li OK OCs Next RE Time Runn Attendue 1 Hour. 46 Question 19 4 pts The likely formula of the compound formed between Ca and Nis O CasN2 o CaN2 O Ca N2 CaN O Ca N Next > Previous D Question 20 Time Running Anme 00 1 Hour 16 Minu 4 pts Consider the following reaction: 2 Mg + O2 + 2 MgO AH-1203 kJ Calculate the amount of heat (in kJ) associated with complete reaction of 1 moles of Me 0 4812 kJ 60150 2406 kJ O 301.5 kJ 1203 kJ Nexd • Previous Question 21 Attempt the Oct 30 1 Hour, 46 Minutes 4 pts If the reaction shown below is exothermic, the energy level of the reactants is H2 + O2 + 2H,0 O higher than that of the products o lower than that of the products O higher than the activation energy of the reaction O possibly lower, possibly higher than that of the products o the same as that of the products No answer text provided Noyt

Answer 1

The element with the lowest ionisation energy is calcium, and the atom with the most metallic character is cesium. The likely formula of the compound formed between calcium and nitrogen is CaN2.

Step-by-step explanation:

The element with the lowest ionization energy is Ca (calcium). Ionization energy is the amount of energy required to remove an electron from an atom. Calcium has a lower ionization energy compared to oxygen (O), aluminum (Al), and barium (Ba).

The atom with the most metallic character is Cs (cesium). Metallic character refers to the ability of an atom to lose electrons and form positive ions. Cesium is the most metallic of the given options, followed by rubidium (Rb), sodium (Na), and lithium (Li).

The likely formula for the compound formed between calcium (Ca) and nitrogen (N) is CaN2. Calcium has a +2 charge, and nitrogen has a -3 charge. To balance the charges, two calcium ions combine with one nitrogen ion to form CaN2.

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