Question

5.

Why do you think hydrogen (element 1) is on both sides of the periodic table? (2 marks)
Name a metal that is in the liquid state at room temperature. (1 mark)
8. Explain the difference between an atom and an ion. (2 marks)
9.
6789
6.
Will astatine (element 85) look more like
marks)
7.
Use your periodic table, pick out which atom with the highest ionization energy in these lists: (1
mark each = 4 marks)
a) Na, Sr, Be, Rb
b) B. Al, C, Si
c)
Fr, Fe, Zn, Cl
d) Cu, Ag, Au, B
10. Why is second ionization energy of atom always larger than its first ionization energy? (1 mark)
11. Which of the atoms in each of the following groups has the largest atomic radius? (1 mark each
= 3 marks)
a) Cl, Si, K
b) Cs, Ca, Be
c) N, Al, Cl
12. Arrange these groups of atoms in order of increasing atomic radius: (1 mark each = 3 marks)
a) Xe, Ar, Kr
b) K, Br, Ca
c) B, C, N
13. Explain two reasons why atomic radii increase from top to the bottom. (2 marks)
14. Explain a reason why atomic radii decrease from the left to right. (1 mark)
15. Which atom in each of the following pairs has the highest electronegativity? (1 mark each
= 3 marks)
a) Zn or Ge
b) O or Te
c) Ba or Hg
16. Which atom in each of the pairs that follow has the higher electron affinity and therefore gives off
the most energy when it forms a negative ion? (1 mark each = 3 marks)
c) Si, Ga
a) Cl, Br
b) Se, Br

Answer 1

I'll only answer the first 2 questions because there are too many questions.

1) Hydrogen basically does not really belong to Group 1 or 17 of the periodic table. To be exact, there is to such an extent that some might put it under no groups at all. Hydrogen has 1 electron in its valence shell, similar to elements in group 1. Still, it also has to gain 1 more electron to attain noble gas configuration (2 electrons for 1st shell, 8 electrons for 2nd shell). Hence, no one actually knows what hydrogen should be classified in, hence classifying it into either Group 1, 17 neither or both.

2) Mercury is the only metal that will be in liquid state at room temperature at 1 atm.