Answer: a. Have an overall neutral charge
b. Have electrons that are not equally shared
d. Have slight positive and negative ends
Explanation:
Electronegativity is defined as the property of an element to attract a shared pair of electron towards itself.
A polar covalent bond is defined as the bond which is formed when there is a difference of electronegativities between the atoms. Example: 
The more electronegative element i.e. chlorine acquires a partial negative charge as it withdraws the electron density towards itself. Thus hydrogen acquires a partial positive charge. The opposite charges cancel each other and thus overall it is electrically neutral.
Answer:
Look in explanation.
Explanation:
Mendeleev has ordered the elements based on increasing atomic mass, he has skipped some elements but assumed that they existed and managed to find the atomic mass of the "unknown" elements.
Atoms are neutral because they have same number of positively charged particles, protons, and negatively charged particles, electrons. The amount of charge in a single proton is equal to the amount of charge possessed by a single electron. Atoms also have another particle type in the nucleus called neutrons that have no charge.
Heat from warming the food, electromagnet which is electric and magnet energy which can count for 2
The <u>secretion</u><u> </u>of acids, buffers, enzymes, and water aids in the breakdown of food.
The food moves through the gastrointestinal tract and breaks down into smaller particles for energy, cell repair, and growth.
Digestion begins when eating and chewing food with the help of teeth in the mouth, then it goes down to the small intestine.
While moving through the gastrointestinal tract it mixes with juices, acids, enzymes, and water which disintegrates the large molecules of food into smaller ones and makes it suitable for assimilation and absorption in the body.
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