ذرة عنصرية

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{n} atom
The smallest medieval unit of time, equal to fifteen ninety-fourths of a second
{i} smallest part of an element (Physics, Chemistry); something that is extremely small, minute or microscopic object
A theoretical particle of matter, imagined to be incapable of further division; the smallest possible unit of substance
The smallest possible amount of matter which still retains its identity as a chemical element, now known to consist of a nucleus surrounded by electrons
The smallest unit of an element It consists of a nucleus containing one or more protons (and almost always neutrons), surrounded by an equal number of electrons
The smallest unit of a chemical element that can still retain the properties of that element Atoms combine to form molecules, and they themselves contain several kinds of smaller particles An atom has a dense central core (the nucleus) consisting of positively charged particles (protons) and uncharged particles (neutrons) Negatively charged particles (electrons) are scattered in a relatively large space around this nucleus and move about it in orbital patterns at extremely high speeds An atom contains the same number of protons as electrons and thus is electrically neutral and stable under most conditions
An ultimate indivisible particle of matter
A basic unit of matter It is the smallest particle of an element that still has the characteristics of that element Every atom has a positively charged central nucleus, surround by a number of negatively charged electrons More about atoms
The smallest part of an element that has all the properties of the element
The smallest, indivisible constituent part or unit of something
The smallest particle of an element
An atom is the smallest amount of a substance that can take part in a chemical reaction. Smallest unit into which matter can be divided and still retain the characteristic properties of an element. The word derives from the Greek atomos ("indivisible"), and the atom was believed to be indivisible until the early 20th century, when electrons and the nucleus were discovered. It is now known that an atom has a positively charged nucleus that makes up more than 99.9% of the atom's mass but only about 10^-14 (less than a trillionth) of its volume. The nucleus is composed of positively charged protons and electrically neutral neutrons, each about 2,000 times as massive as an electron. Most of the atom's volume consists of a cloud of electrons that have very small mass and negative charge. The electron cloud is bound to the nucleus by the attraction of opposite charges. In a neutral atom, the protons in the nucleus are balanced by the electrons. An atom that has gained or lost electrons becomes negatively or positively charged and is called an ion
The smallest mediaeval unit of time, equal to fifteen ninety-fourths of a second
(physics and chemistry) the smallest component of an element having the chemical properties of the element
The smallest particle of matter into which an element can be resolved by chemical means; retains the same chemical properties as the original element
The smallest unit of an element
To reduce to atoms
A non-zero member of a Boolean algebra that is not a union of any other elements
The smallest particle of an element that retains any of the properties of the element