introduction to structure of atom for project
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Answers
A smallest unit of element which consists of a dense, central positively charged nucleus surrounded by negatively charged electrons is called as atom.
Atom is divided into two parts – Atomic structure and extra nucleus part. Atomic structure consists of positively charged proton (P+) and neutral neutron (n°). Extra nucleus part contains negatively charged electrons (e-).
Atoms have mass as all elements and compounds have mass. The mass of atom is mainly concentrated in its nucleus because of protons. Protons has highest mass as compare to electrons and neutrons.
Hydrogen is the lightest of all elements and the nucleus of hydrogen atom contains one proton surrounded by one electron.
The nucleus of every atom contains fixed number of protons which attracts same number of electrons and an atom becomes electrically neutral. Ions can be formed either by adding or by removing electrons from the atom.
Answer:
An atom is composed of two regions: the nucleus, which is in the center of the atom and contains protons and neutrons, and the outer region of the atom, which holds its electrons in orbit around the nucleus.
Protons and neutrons have approximately the same mass, about 1.67 × 10-24 grams, which scientists define as one atomic mass unit (amu) or one Dalton.
Each electron has a negative charge (-1) equal to the positive charge of a proton (+1).
Neutrons are uncharged particles found within the nucleus.