Решить методом интервалов неравенство: x(x-8)(x-7)> 0

x(x-8)(x-7)> 0

                          (+)                                                      (+)

)////////()///////

заштрихованные области и есть решения неравенства:

(0; 7)v(8; бескон)

 

х = 0, х - 8 = 0,  х - 7 = 0

                      х = 8              х = 7

            -                                    +                             -                   +

  >

                  0                     7             8          

ответ: (0; 7) ∨ (8; + ∞)

Сколько спаренных и неспаренных электронов содержат эти атомы? Сколько неспаренных электронов содержат ионы Fe2+, Cu2+, As3- ?

Задание №2

Расположите элементы в порядке увеличения:

а) металлических свойств - Se, Li, Br, Rb, Cr, K, Sc

б) электроотрицательности - As, Ge, S, Cl, O, P, Mg

в) радиуса атома - I, Zr, S, As, F, Te, N

Задание №3

Расположите высшие гидроксиды стронция, йода, молибдена, циркония и сурьмы в порядке убывания их кислотных свойств. Объясните причину такого изменения свойств гидроксидов. Приведите пример аналогичного изменения свойств на примере гидроксидов одного металла.

Задание №4

Используя правило Гунда, приведите электронные и

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