1. How does ionization energy change with atomic number? Use evidence from the graph to support your claim. 2. How does ionization energy change across a period and down a group on the periodic table? Use evidence from the graph to support your claim.

3. What describes an effect on ionization energy when moving down a group? Select all correct answers.

A. The ionization energy increases down a group

B. The ionization energy decreases down a group

C. The valence electrons are in energy levels farther from the nucleus

D. The shielding effect is less

african americans demonstrated their newly found freedom by relocating often in search of relatives whom they had been separated from during slavery. others established schools to educate freed people and they built institutions such as churches and political organizations to advocate for their rights.

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).

i think it's c. if you look search electronic symbol on google and then click on wiki it shows you a