Answer: Electrons
Which part of an atom has a negative charge?

An atom is the smallest unit of ordinary matter that forms a chemical element. Every solid liquid gas and plasma is composed of neutral or ionized atoms. Atoms are extremely small typically around 100 picometers across. They are so small that accurately predicting their behavior using classical physics—as if they were tennis balls for example—is not possible due to quantum effects. Every at…

An atom is the smallest unit of ordinary matter that forms a chemical element. Every solid liquid gas and plasma is composed of neutral or ionized atoms. Atoms are extremely small typically around 100 picometers across. They are so small that accurately predicting their behavior using classical physics—as if they were tennis balls for example—is not possible due to quantum effects. Every atom is composed of a nucleus and one or more electrons bound to the nucleus. The nucleus is made of one or more protons and a number of neutrons. Only the most common variety of hydrogen has no neutrons. More than 99.94% of an atom's mass is in the nucleus. The protons have a positive electric charge the electrons have a negative electric charge and the neutrons have no electric charge. If the number of protons and electrons are equal then the atom is electrically neutral. If an atom has more or fewer electrons than protons then it has an overall negative or positive charge respectively – such atoms are called ions. The electrons of an atom are attracted to the protons in an atomic nucleus by the electromagnetic force. The protons and neutrons in the nucleus are attracted to each other by the nuclear force. This force is usually stronger than the electromagnetic force that repels the positively charged protons from one another. Under certain circumstances the repelling electromagnetic force becomes stronger than the nuclear force. In this case the nucleus splits and leaves behind different elements. This is a form of nuclear decay. The number of protons in the nucleus is the atomic number and it defines to which chemical element the atom belongs. For example any atom that contains 29 protons is copper. The number of neutrons defines the isotope of the element. Atoms can attach to one or more other atoms by chemical bonds to form chemical compounds such as molecules or crystals. The ability of atoms to associate and dissociate is responsible for most of the physical changes observed in nature. Chemistry is the disciplin… Read more on Wikipedia

In philosophy The basic idea that matter is made up of tiny indivisible particles is very old appearing in many ancient cultures such as Greece and India. This ancient idea was based in philosophical reasoning rather than scientific reasoning and modern atomic theory is not based on these old concepts. The word a…

In philosophy The basic idea that matter is made up of tiny indivisible particles is very old appearing in many ancient cultures such as Greece and India. This ancient idea was based in philosophical reasoning rather than scientific reasoning and modern atomic theory is not based on these old concepts. The word atom is derived from the Greek word atomos which means "uncuttable". Dalton's law of multiple proportions In the early 1800s John Dalton compiled experimental data gathered by himself and other scientists and discovered a pattern now known as the " law of multiple proportions ". He noticed that in chemical compounds which contain a particular chemical element the content of that element in these compounds will differ by ratios of small whole numbers. This pattern suggested to Dalton that each chemical element combines with others by some basic and consistent unit o...

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