Answer:
3 valence electrons
Explanation:
Aluminum has three valence electrons. Valence electrons are found in the outermost shell of an element and are responsible for its valence.
B, turns red litmus paper to blue
Answer:
II) Objects made of silver become tarnished.
Explanation:
Physical properties are the properties which can be observed without changing identity of substance.
Chemical properties are the properties which describe how the substance changes into the different substance completely.
Boiling is an example of physical change in state of the substance. Color is also an example of physical property like boiling point and hence these are constants. The reason of the color is that the chromium ions shows certain colors as the electrons are excited due to absorption of the light. The tarnishing of the silver is an example of the chemical change which occurs due to the reaction of the silver with oxygen. This is also known as corrosion.
<h2>YOUR ANSWER Is number of istopes</h2>
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