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Номер периода, в котором расположен химический элемент, характеризует:
1) число энергетических уровней
2) число валентных электронов
3) формулу высшего оксида
4) высшую валентность
Ответы 1
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4)характеризует высшую валентность
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Автор:
dolcewi43 - 5 лет назад
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Сколько нечетных трехзначных чисел можно составить из цифр 3,4,8,6 ПРИ УСЛОВИИ,ЧТО ЦИФРЫ В ЗАПИСИ ЧИСЛА НЕ МОГУТ ПОВТОРЯТЬСЯ?
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I. Употребите нужную форму глагола, выбрав правильный вариант ответа.
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a.come b. comes c. came d. will come
3. She always _____ to the South with her family.
a.goes b. go c. will go d. went
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a.plays b. play c. played d. playing
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a.go b. goes c. will go d. well
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a.does b. do c. did d. go
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a.will b. do c. play d. did
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a.was b. were c. are d. am
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a. watched b. were watching c. have watched d. watch
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a. had b. was having c. was have d. has
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a. you buy b. do you buy c. are you buying d. you are buying
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