Предмет: Химия, автор: tanyakozina84

определите заряд ядра у следующих изотопов Na, Cl, As, Pb

Ответы

Автор ответа: Аноним

Приветствую!
Заряд ядра Натрия ( Na ) равен +11.
Заряд ядра Хлора ( Cl ) равен +17.
Заряд ядра Мышьяка ( As ) равен +33.
Заряд ядра Cвинца ( Pb ) равен +82.
На будущее:
Зарядовое число равно заряду ядра в единицах элементарного заряда и одновременно равно порядковому номеру соответствующего ядру химического элемента в таблице Менделеева.
Удачи! :-)

Предыдущий вопрос

Следующий вопрос

Похожие вопросы

Предмет: Русский язык, автор: Кек89108038888

разобрать слово по составу устилали

1 год назад

Предмет: Английский язык, автор: Help3154

Срочно перевод текста пожалуйста

1 год назад

Предмет: Английский язык, автор: vladislav545678

переведите пожалуйста текст
The mountain road was violently zigzagging, but the driver did not slow down. He seemed to be more concerned with two timetables – that of the bus and school lessons. The bus had to arrive at a country school in time for the next lesson.
Personal computers are mounted in the bus’s interior where basic instruction is given under the school curriculum in information science and computer technology. Children from village and town schools are thus learning to operate computers. It is one of the forms of implementing the countrywide programme for computer knowledge among students. At present the fundamentals of information science and computer technology are studied at nearly 60,000 secondary schools throughout the country. The subject has been included in the curricula of the tenth and eleventh forms. As an experiment, computer lessons sometimes start at an earlier age, even at the elementary school.
The authors of the experiments have developed teaching methods that allow computer operation to be combined with strengthening the oral count habits, developing the so-called sense of numbers, improving the standards of logic and mathematical thinking. For example, a mathematical dictation for solving textual problems. Teachers know that with the conventional methods the better part of the math lesson is spent on putting down the solutions of problems (as a rule, children wrote slowly) and calculations. The logic part of the solution takes very little time. With computer equipment, this can be done efficiently and with the entire class participating.
The teacher slowly dictates the problem, while the children are not writing but listening attentively and thinking about the development. After a repeat, they immediately work out the problem on a computer or calculator. The computer enables them to check the solution. In the second part of the lesson, the pupil comments on the line of reasoning. Using this method, the pupils of experimental classes can solve eight to ten problems in 15 to 20 minutes.
The introduction of the new course in schools made it imperative to reorient the higher educational establishments, too: over a hundred faculties and departments were opened to provide training in information science and computer technology.
General secondary and vocational schools, teacher-training institutes and universities had to be equipped with computer technology.
In many areas children are taken by bus to a specialized centres, where they learn the new subjects because so far special classrooms cannot be equipped in every school.
In some regions another approach has been taken – busses were equipped with every necessary, and their schedules were timed to serve the lessons at schools.

1 год назад

Предмет: Психология, автор: nolove16

В классе состоялась контрольная работа по английскому языку. Это была первая контрольная в этом учебном году у новой учительницы. Переводы были сделаны в основном правильно, но в написании слов учащиеся допустили массу ошибок. Прежняя учительница за это оценки не снижала. А новый преподаватель снизил. Ученики усмотрели в этом проявление несправедливости. Некоторые тут же демонстративно порвали свои работы.
Как бы поступили вы в данном случае, чтобы избежать конфликтной ситуации в классе?

7 лет назад

Предмет: Биология, автор: 090319

какие растения называют покрытосеменными?
Почему они получили такое название?

7 лет назад