hi guys i need heeelp Which pair of elements below should be the most similar in

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hi guys i need heeelp

Which pair of elements below should be the most similar in chemical properties? Cs and He I and Br B and As K and Kr C and O Question 12 An element in the upper right corner of the periodic table is definitely a metal is either a metal or metalloid is either a metalloid or a non-metal is definitely a non-metal is definitely a metalloid Save Question 13 The element X has three naturally occurring isotopes. The masses (amu) and % abundances of the isotopes are given in the table below. The average atomic mass of the element is amu. Question 14 A sample of CH2F2 with a mass of 19 g contains atoms of F. Question 15 Which one of the following is most likely to lose electrons when forming an ion? Question 16 Which species has 18 electrons? Save

Explanation / Answer

11) I-Br

12) definetly a non metal

13) avg mass= ( 0.7422 x 220.9) + ( 0.1278 x220) + ( 0.13 x 218.1) = 220.42 gm/mol

14) moles of CH2F2 = 19/52.02 = 0.365244

number of F = moles of F x avagadro number = 2 x 0.365244 x6.023 x 10^23 = 4.4 x 10^23

15) P

16) S2-

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