Question

Question 1:- Which element in each pair is more reactive: i) ii') iii) iv) O or S Be or Ca Na or Mg Li or Rb a) O, Ca, Na, Rb b) S, Ca, Mg, Li c) O, Be, Mg, Rb d) S, Ca, Na, Li​

Answer 1

Answer:

d

Explanation:

It has more reactive elements

Answer 2

Answer:

Explanation:

• O reacts more quickly.
• Compared to sulphur, it is more electronegative.
• Ca reacts more quickly.
• Ca has a higher electro positivity than Be Na is quicker to react.
• When compared to Mg, Rb has a much lower IE and is more reactive.
• IE is significantly lower than Li.

Oxygen:

The chemical element with the atomic number 8 and symbol O is called oxygen. It belongs to the periodic table's chalcogen group, is a very reactive nonmetal, and an oxidizing agent that easily produces oxides with most elements as well as other compounds. After hydrogen and helium, oxygen is the third most plentiful element in the universe and the most abundant element on Earth. Two atoms of the element combine to generate dioxygen, an odourless and colourless diatomic gas with the formula O, at standard pressure and temperature.

Calcium:

The chemical element calcium has the atomic number 20 and the letter Ca as its symbol. Calcium is an alkaline earth metal that reacts with air to create a black oxide-nitride coating. Its heavier homologues barium and strontium are most similar to it in terms of physical and chemical characteristics. It is the third most plentiful metal, behind iron and aluminium, and the fifth most abundant element in the crust of the Earth.

Sodium:

Sodium is a chemical element with the atomic number 11 and the symbol Na (derived from the Latin natrium). It is a delicate, silvery-white metal that is exceedingly reactive. Due to its placement in group 1 of the periodic table, sodium is an alkali metal. 23Na is the only stable isotope of it. The free metal must be synthesized from compounds because it does not exist in nature. The sixth most common element in the crust of the Earth is sodium, which may be found in a variety of minerals such feldspar, sodalite, and halite (NaCl).

Rubidium:

The chemical element with the atomic number 37 and symbol Rb is called rubidium. The alkali metal family includes the extremely soft, whitish-gray metal rubidium. In terms of its physical characteristics, softness, and conductivity, rubidium metal is comparable to potassium metal and caesium metal. A highly exothermic reaction will occur when storing rubidium in air oxygen, sometimes even causing the metal to catch fire.

Hence the more reactive elements are a) O, Ca, Na, Rb.

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