A1-cubic-centimeter cube of sodium reacts more rapidly in water at 25°c than does a 1-cubic-centimeter cube of calcium at 25°c. this difference in rate of reaction is most closely associated with the different
a) surface area of the metal cubes
b) nature of the metals
c) density of the metals
d) concentration of the metals

As given that the

a) temperature is same for both the metals

b) the volume of both the cubes is same (Same dimension)

The metals are sodium and calcium

Sodium has atomic number = 11

the electronic configuration is 1s2 2s2 2p6 3s1

It will attain noble gas configuration by easily losing one electron only

calcium has atomic number = 20

the electronic configuration is 1s2 2s2 2p6 3s2 3p6 4s2

It will attain noble gas configuration by donating two electrons so calcium is less reactive than sodium

hence the difference in the rate of reaction is most closely associated with the different nature of the metals

gas

explanation:

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explanation:

let the different atoms be x and y. each with four protons and same mass will be represented as follows.

mass number is number of protons + number of neutrons.

            and  

since, it is given that one has a negative charge while the other is neutral. therefore, there will be increase in number of protons and the atom will be represented as follows.

according to periodic table, mass number of beryllium is 9 and it has atomic number 4 so, the atoms will be and .  

the protons and neutrons will be located inside the nucleus whereas the electrons will be revolving around the nucleus.