<em>Ethnocentrism is a normal reaction in taken pride in the success of your ethnicity but destructive when taken too far as to want to destroy other perceived lesser ethnic group.</em>
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Explanation:
Ethnocentrism is the belief in the superiority of one's culture over others. Ethnocentrism is associated with the pride of falling into a particular culture, and is a learned behavior passed down from parents and society to the young ones among them. Ethnocentrism can be considered a normal reaction, when one finds oneself as a member a group that seems to have excelled in a particular way of life. Example is the feeling of pride that comes with your country winning the FIFA world cup; and its only natural to demonstrate ethnocentric characteristics in this case. A destructive effect of ethnocentrism can be demonstrated through genocide; in which a particular ethnicity rises up to destroy violently another perceived lesser ethnic group. This wrong ethnocentric drive has been a reason for the loss of millions of life globally.
A tennis player with two sneakers wouldn't bond to any other tennis player because he is already stable and complete with the 2 and doesn't need another players assistance to make him stand well.
However, helium atom with two electrons wouldn't bond to any other atoms because it is stable. This stability arises from the fact that it has two protons and 2 electrons, of which the 2 electrons completely fill its valence shell/outer most shell to make it neutral.
Atoms consist of three basic particles: protons, electrons, and neutrons. The nucleus (center) of the atom contains the protons (positively charged) and the neutrons (no charge). The outermost regions of the atom are called electron shells and contain the electrons (negatively charged).
The mass of objects remains constant throughout the universe. This is because an object is made of he same amount of matter (atoms), no matter where you take it in the universe. If you take an object from the Earth to the moon, only the weight will change.