description nent in Period 2 and Group 8A. hetal in Group 6A. Does any element with Z ≤ 92 match the description? O Yes O Yes O No O No

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

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

description An element in Period 1 and Group 6A. A metalloid in Group 4A. A halogen with a lower atomic number than nitrogen. A main-group element in Period 4. Does any element with Z≤ 92 match the description? Yes Yes Yes Yes No No No No If you checked yes, give the symbol of an element with Z ≤ 92 that matches. 0 0 0 □

Use the following data and the Born-Haber cycle to calculate the first ionization energy (ΔH IE1) of K(g) K(s) → K(g) 89 kJ mol-1 Cl(g) + e– → Cl–(g) -349 kJ mol-1 K(s) + ½ Cl2(g) → KCl(s) -437 kJ mol-1 K(g) → K+(g) + e– ΔH IE1 Cl2(g) → 2Cl(g) 244 kJ mol-1 K+(g) + Cl–(g) → KCl(s) -717 kJ mol-1

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

You will be assigned a Periodic Table Group (1, 2, 13, 15, 16, 17). With the Periodic Table Group you have been assigned, create an element name for your newly discovered element. You can name it after yourself or the place you discovered it or a special property it has. For example, Randy named his element Ranonium! You will also need a unique two letter element symbol for it. Make sure the symbol has not been used for another element on the periodic table. Ranonium has the symbol Ra. Your initial post should include the following items: Periodic Table Group 13 Element Name Element Symbol (two letters only) Is it a metal or a non-metal? How many valence electrons is it expected to have considering what Group it is in? Upload a picture of the Lewis Dot Symbol.

Decide which element has the greater size and defend your answer: (i) B or Si; (ii) C or P

Which of the following elements would you expect to have positive electron affinity? Ne Br Cl F O

Read the given expression. X= number of protons - number of core electrons Which of the following explains the identity of X and its trends across a period? OX is the effective nuclear charge, and it remains constant across a period. OX is the screening constant, and it remains constant across a period. OXis the effective nuclear charge, and it increases across a period. OX is the screening constant, and it increases across a period.