In which one of the following pairs do the two species resemble each other most closely in chemical properties: (a) 1h1 and 1h1+ (b)14n7 and (14n7)-3 , (c) 12c6 and 13c6? explain.

c.        ₆¹²C   and   ₆¹³C

Explanation:

Properly writing the given options:

  a.   ₁¹H    and    ₁¹H⁺

  b.    ₇¹⁴N    and    ₇¹⁴N³⁻

  c.     ₆¹²C   and   ₆¹³C

Electrons are the crux of chemical reactions. These negatively charged subatomic particles determines chemical properties of atoms and how they combine with other atoms.

Atoms having the same number of electrons especially in their valence shells shares similar chemical properties.

From the problem above, we have been given some information about the atom.

The mass number is given by the superscript before the symbol of the atom and it signifies the sum of the number of protons and neutrons in the atom.

The atomic number is shown by the subscript and it denotes the number of protons in the atom.

For neutral atoms that has not lost or gained any additional electron, the atomic number is the same as the number of electrons.  

The superscript after the atom is the charge on the particle. It represents the number of electrons lost or gained by the atom.

In {c.  ₆¹²C   and   ₆¹³C}, the atom is in a neutral state. Here the atomic number which is 6 is the number of protons in the atom. This is also the number of electrons in the atom. Therefore, the two atoms would have similar chemical properties and behavior.

This is not so for the others as their number electrons are different.

most historians agree that gabriel mouton, the vicar of st. paul’s church in lyons, france, is the “founding father” of the metric system. he proposed a decimal system of measurement in 1670. mouton based it on the length of one minute of arc of a great circle of the earth (now called a nautical mile, 1852 meters). he also proposed the swing-length of a pendulum with a frequency of one beat per second as the unit of length (about 25 cm). a pendulum beating with this length would have been fairly easy to produce, thus facilitating the widespread distribution of uniform standards. over the years, his work was revised, improved, and extended by a number of french scientists.

the political sponsor of weights and measures reform in the french revolutionary national assembly was the bishop of autun, better known as talleyrand. under his auspices, the french academy appointed several committees to carry out the work of developing a usable system of weights and measures for france. one of the committees recommended a decimalized measurement system based upon a length equal to one ten-millionth of the length of a quadrant of the earth’s meridian (i.e., one ten-millionth of the distance between the equator and the north pole).