Isaiahtate053
29.06.2019 •
Chemistry
When dimitri mendelev first developed the periodic table, one of the most important features that he introduced was starting a new row at a certain point. what factor was most important to mendelev in knowing when to end a row (period) and start a new one? a) the reactivity of the elements changed drastically. b) the state of the elements went from solid to liquid. c) the boiling point of the elements decreased dramatically. d) the size of the elements jumped from very large to very small.
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Ответ:
At the end of a period we get an inert gas which is very unreactive compared with the previous element ( a halogen).
The answer is A.
Ответ:
Hydrogen ion concentration is more conveniently expressed as pH, which is the logarithm of the reciprocal of the hydrogen ion concentration in gram moles per liter.
Explanation:
Thus, in a neutral solution the hydrogen ion (H+) and the hydroxyl ion (OH−) concentrations are equal, and each is equal to 10−7. A pH of 7 is neutral.