Answer:
1,2,5
Explanation:
Hydrogen can't really be classified into any group in the periodic table because it doesn't have properties that match that of any group exactly. However it exhibits a property of group 1A (formation of a univalent positive ion) and that of group 7A (formation if a univalent negative ion). It contains only one electron, hence this outermost electron is not shielded at all from the nucleus.
The answer to this question is is d
The purpose of this process is to make sure that the substance is completely melted before trying to figure up the mass. if there are still bits of solid in the liquid the mass will be incorrect if just taken the first time. Also, some substances have gaseous elements in them so to heat it up, it releases those gases and you’re left with the true mass in the liquid.
hope this helps!
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Explanation:
I think there are two choices that would be correct. The ideas by the Ancient Greeks that is least partially supported by scientific experiments are light is a stream of rays that comes with great velocity from the eyes of an observer and it is the result of rays that leave the eyes, reflect off an object, and interact with sunlight to become visible. It was the Greeks who laid out basic laws about reflection and refraction where they found that the angle of incidence is the same as the angle of reflection. They thought light rays came from the eye and that it travels towards the object which results to the objects as visible. This was called the concept of intromission.<span />