It is desirable that pesticides eventually decompose in the environment to give harmless products. If the half-life for the decomposition of a certain pesticide is 10.2 years, and

the present concentration of this pesticide in a lake is 3.1 × 10-5 /mL, what was its

concentration 4 years ago?​

If a hydrogen atom is neutral, it must also have  one electron. an oxygen atom (o) has an atomic number of eight (8). this means a neutral oxygen atom has eight protons and eight electrons. the element actium (ac) has an atomic number of 89, so it has 89 protons and 89 electrons in a neutral atom

Is a logical series of steps

Yeah, but what are you trying to ask?

The se-ci  bonds is more polar  than s-br bond