The atomic number is always equal to the number of protons. It will be equal to the number of elections also if the atom has a neutral charge.
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Okay, well the first thing we need to understand with chemistry is something known as Reaction Rates. This is the amount of time it takes to complete a reaction.
Acidic Rain will not cause a building to instantly crumble or anything like that. Instead, calcium carbonate (which is chalk) will slowly break down due to acidity of the rain.
When something has a very high or very low ph, it is known to be corrosive. An example of a type of corrosion is the reaction between copper and oxygen to produce rust.
When Acidic Rain interacts with calcium carbonate, over time it will slowly start to degrade and break down. One thing you can compare it to is erosion.
Answer:
Frequency = 4.5 × 10¹⁴ Hz
Explanation:
Given data:
Wavelength of light = 670.8 nm (670.8 ×10⁻⁹ m)
Frequency of light = ?
Solution:
Speed of light = wavelength × frequency
Frequency = Speed of light / wavelength
Speed of light = 3 × 10⁸ m/s
Frequency = 3 × 10⁸ m/s / 670.8 ×10⁻⁹ m
Frequency = 0.0045 × 10¹⁷ s⁻¹
Frequency = 4.5 × 10¹⁴s⁻¹
s⁻¹ = Hz
Frequency = 4.5 × 10¹⁴ Hz
Hey :)
Ernest Rutherford produced the nuclear model of the atom
In 1909 Ernest Rutherford designed an experiment to test the plum pudding model
In the experiment, positively charged alpha particles were fired at thin gold foil. Most alpha particles went straight through the foil
This evidence led Rutherford to suggest a new model for the atom, called the nuclear model
Hope this helps :)