A period in the periodic table is one of the horizontal rows, all of those elements have the same number of electron shells. Going across a period, each element has one more proton and is less metallic than its predecessor. Arranged this way, groups of elements in the same column have similar chemical and physical properties, reflecting the periodic law. For example, the alkali metals lie in the first column (group 1) and share similar properties, such as high reactivity and the tendency to lose one electron to arrive at a noble-gas electronic configuration. As of 2016 a total of 118 elements have been discovered and confirmed.
do periods in the periodic table have similar properties?
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Answer: no

Double jeopardy is a procedural defence that prevents an accused person from being tried again on the same (or similar) charges and on the same facts, following a valid acquittal or conviction. As described by the U.S. Supreme Court in its unanimous decision one of its earliest cases dealing with double jeopardy, ''the prohibition is not against being twice punished, but against being twice put in jeopardy; and the accused, whether convicted or acquitted, is equally put in jeopardy at the first trial.''
is there such a thing as double jeopardy?
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Answer: yes

In the United States House of Representatives, the District is represented by a delegate, who is not allowed to vote on the House floor but can vote on procedural matters and in congressional committees. D.C. residents have no representation in the United States Senate. The Twenty-third Amendment to the United States Constitution, adopted in 1961, entitles the District to the same number of electoral votes as that of the least populous state in the election of the President and Vice President of the United States.
can citizens in washington dc vote for president?
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Answer:
yes