What am I? 2. I have 7 valence electrons and have 2 more protons than "phosphorus. What am I? 3. I am in Period 5 and have properties similar to my favorite cousin, gold. What am I? 4. I am the only element with no neutrons in my nucleus. What am I? 5. I am the only element in Period 3 that has 8 electrons in my outermost energy level. What am I? 6. I am the most massive element on the Periodic Table to have electrons in only one energy level. What am I? 7 I have the smallest atomic number of all the elements that have electrons in three different energy levels? What am I? ​

In which of these cases are the two wave points considered to be in phase with each other?

Answer asap need by wednesday morning explain how a buffer works, using an ethanoic acid/sodium ethanoate system including how the system resists changes in ph upon addition of a small amount of base and upon addition of a small amount of acid respectively. include the following calculations in your i. calculate the ph of a solution made by mixing 25cm3 0.1m ch3cooh and 40cm3 0.1m ch3coo-na+. [ka = 1.74 x 10-5 m] ii. calculate the ph following the addition of a 10cm3 portion of 0.08 m naoh to 500cm3 of this buffer solution. iii. calculate the ph following the addition of a 10cm3 portion of 0.08 m hcl to 200cm3 of the original buffer solution.

Use the periodic table to find the molar mass of each element. molar mass h = g/mol molar mass s = g/mol molar mass o = g/mol