The atomic radius is a measure of the size of the electron cloud, or the region where electrons can be found. To begin, check that H (hydrogen) is selected in Group 1 on the left. Turn on Show
ruler. To measure the radius, drag one end of the ruler to the proton in the nucleus and the other end to the
electron. Click Save radius to record the value.
1.
What is the radius of hydrogen?
Notice that the radius is measured in picometers (pm). A picometer is one
trillionth of a meter.
2.
On the right side of the Gizmo, select Li. Connect the right side of the ruler to
the outermost electron, or valence electron. What is the radius of lithium?
Activity A:
Get the Gizmo ready:
• Check that Atomic radius is selected from the
drop-down menu
Atomic radius
NOVA
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2
3
D

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).

a electronegativity decreases beacuse the size of nucleus is bigger.

the answer is d. 74.02

(b) which contains higher levels of vitamin b, oranges or spinach?

explanation:

you can eliminate a, c, and d because they are questions based on opinions.