Question

reactivity

1. arrange the following element sets from most to least reactive.
2. cs, cd, mo, nb, li
3. kr, ag, te, s, y
4. mo, hg, b, ca, fr
5. ta, os, ir, po, w
6. br, i, f, cl, at
7. rb, na, fr, cs, li
8. v, k, ca, se, ti
9. sn, ni, re, hf, ba

answer the questions

1. when looking at reactivity, why is hydrogen not included with the group 1 metals?
2. why is fluorine (f) the more reactive non - metal instead of helium (he)?
3. why is francium (fr) the most reactive metal? how can you explain using franciums location on the periodic table?
4. reactivity of metals increases to the _ and _. reactivity of non - metals increases to the _ and _

Explanation:

Step1: Recall metal reactivity trends

In the periodic - table, for metals, reactivity increases down a group and to the left in a period. For non - metals, reactivity increases up a group and to the right in a period.

Step2: Analyze the first set (Cs, Cd, Mo, Nb, Li)

Cs is in Group 1, Li is also in Group 1 but higher up, Cd is a transition metal, Mo and Nb are also transition metals. Cs is the most reactive metal among them as it has the largest atomic radius and the easiest to lose an electron. So the order from most to least reactive is Cs > Li > Cd > Mo > Nb.

Step3: Analyze the second set (Kr, Ag, Te, S, Y)

Kr is a noble gas (very unreactive), Ag is a metal, Te and S are non - metals, Y is a metal. Among metals, Y is more reactive than Ag. Among non - metals, S is more reactive than Te. So the order is Y > Ag > S > Te > Kr.

Step4: Analyze the third set (Mo, Hg, B, Ca, Fr)

Fr is in Group 1 and is extremely reactive. Ca is also a metal. Mo and Hg are transition metals, and B is a non - metal. So the order is Fr > Ca > Mo > Hg > B.

Step5: Analyze the fourth set (Ta, Os, Ir, Po, W)

These are mostly transition metals and Po is a metalloid. Their reactivity is relatively low compared to Group 1 and 2 metals. But among them, the order is difficult to precisely rank without more data on specific reactions, but generally, Po might be more reactive than the others due to its position in the periodic table.

Step6: Analyze the fifth set (Br, I, F, Cl, At)

These are halogens. Reactivity decreases down the group. So the order is F > Cl > Br > I > At.

Step7: Analyze the sixth set (Rb, Na, Fr, Cs, Li)

These are Group 1 metals. Reactivity increases down the group. So the order is Fr > Cs > Rb > Na > Li.

Step8: Analyze the seventh set (V, K, Ca, Se, Te)

K is in Group 1, Ca is in Group 2, V is a transition metal, and Se and Te are non - metals. So the order is K > Ca > V > Se > Te.

Step9: Analyze the eighth set (Sn, Ni, Re, Hf, Ba)

Ba is in Group 2, Ni and Sn are metals, Re and Hf are transition metals. So the order is Ba > Sn > Ni > Hf > Re.

Answer:

to question 9:
Hydrogen is not included with Group 1 metals because although it has 1 valence electron like Group 1 metals, it is a non - metal under normal conditions. It does not exhibit the typical metallic properties such as high electrical and thermal conductivity, malleability, and ductility like Group 1 metals. Also, its reactions are different in many ways. For example, Group 1 metals react with water to form hydroxides and hydrogen gas, while hydrogen itself is the product in many reactions and participates in covalent bonding more often compared to the ionic bonding characteristics of Group 1 metals.