Answer:
Fossil fuels contribute to greenhouse gases, which is one of their major disadvantages. The most harmful for the environment is coal because it has many more harmful combustion products than other fossil fuels.
<span>The two elements that are responsible for acid rain are sulphur and nitrogen.</span>
<u>Answer:</u> The given electronic configuration is long hand notation.
<u>Explanation:</u>
Long-hand notation of representing electronic configuration is defined as the arrangement of total number of electrons that are present in an element.
Noble-gas notation of representing electronic configuration is defined as the arrangement of valence electrons in the element. The core electrons are represented as the previous noble gas of the element that is considered.
The given electronic configuration of potassium (K): 
The above configuration has all the electrons that are contained in the nucleus of an element. Thus, this configuration is a long-hand notation.
Answer:
the molecular weight of H2SO4 is 98.086g/mole
Liquid for sure,
mercury,
gas,
all i can think off