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No, as they are composed of different elements they have different numbers of protons.

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Q: Has the cl2 and br2 the same number of proton?
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What happens when a atom loses an electron?

Forms an ion. e.g if chlorine loses an electron it will go form Cl2 ---> cl2+


An element is determined by what?

By the number of protons in the nucleus. So the atomic number decides the element. If it is 1, then that is Hydrogen element. 2 is for Helium, 3-Lithium, 4-Berilium, 5-Boron and so on. Gold element has 79 protons in its nucleus. Mercury has 80. So with a high sophisticated technology if we take only one proton from each mercury atom, then we can produce gold. So mercury has been changed into gold. So transition of element is only by physical means not by chemical means.


What temperature will xenon atoms have same average speed that Cl2 molecules have at 24 degrees C?

First you need to find the root mean square speed of Cl2 at 24 degrees C using the formula sqrt(3RT/Mm) where R is the gas constant, T is the temperature in K, and Mm is molar mass. Approximately 34.24 m/s. Now perform a simple algebra problem to solve for the temperature Xenon atoms will reach this speed.


What element is found in a diatomic molecule and has the same properties as a gas found in earth's atmosphere?

There a multiple elements that fit this description. Oxygen is a diatomic gas found in the earth's atmosphere. Nitrogen is also a diatomic gas found in the earths atmosphere. Thus, both of these elements fit the description.


An atom having a net electrical charge is?

Atoms are always without charge because this is the 'ground' state of any atomic element. The number of electrons equals the number of protons, so there is NO net charge. When electrons are gained (eg. by Cl2) or donated (eg. by Na) the compound can be formed by the newly formed ions (Cl- and Na+ will combine to NaCl)