Which pair of elements show similarities in the pattern of chemical bonding? a. lithium and sodium b. beryllium and boronc. carbon and surfurd. hydrogen and heliume. hydrogen and lithium

Option (A) is the correct answer.

Explanation:

It is known that elements present in the same group tend to show similar chemical properties because they have same number of valence electrons.

Lithium and sodium are both group 1 elements and each of them have 1 valence electron. Hence, they show similar chemical properties.

Beryllium is a group 2 element and boron is a group 13 element. Hence, they do not show any similar chemical properties.

Carbon is a group 14 element and sulfur is a group 16 element. Hence, they do not show any similar chemical properties.

Hydrogen has only one electron and helium is a noble gas as it has only 2 electrons. Hence, they do not show any similar chemical properties.

Hydrogen shows the properties of both metals and non-metals. Whereas lithium being a metal will show the properties of metals only. Hence, they do not show any similar chemical properties.

Thus, we can conclude that out of the given options lithium and sodium is the pair of elements show similarities in the pattern of chemical bonding.

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).

answer7,570,82356 cubic centimeters;