The graph below represents successive ionization energies (IEs) in kJ/mol for a particular element in period 3. Identify the element. 35000 30000 25000 20000 15000 10000 5000 IE 1 IE2 IE3 IE4 IES IE6 E7 E8 O Chlorine O Aluminum O Phosphorous Silicon O Argon 2 Oxygen

Refer to the following figure (first three rows of the periodic table) to answer the questions below. First shell Second shell Third shell Hydrogen H Lithium LI Beryllium Be O helium 09 O hydrogen Boron Sodium Magnesium Aluminum Silicon Na Mg 13A 1651 Oi Atomic mass OB Carbon Nitrogen C N O beryllium O both hydrogen and beryllium He 4.000 O# -Atomic number. Element symbol- Electron distribution diagram Oxygen 10 What element does not prefer to react with other elements? Fluorine Phosphorus Sulfur Chlorine 105 17C1 # Hellum He Neon Ne Argon Ar

An atomic cation with a charge of +2 has the following electron configuration: 1s²2s²2p What is the chemical symbol for the ion? How many electrons does the ion have? How many 1s electrons are in the ion? 0 0 X 3

Re-order each list in the table below, if necessary, so that the atoms or ions in it are listed in order of decreasing size.   1)  Na, K, Li 2)  Al, Ar, Mg 3) Se^2-,  Kr, Se