Question

Define Atom.............​

Answer 1

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.

Components: Electrons and a compact nucleus of protons and neutrons

Electric charge: zero (neutral), or ion charge

Mass range: 1.67×10−27 to 4.52×10−25 kg

Diameter range: 62 pm (He) to 520 pm (Cs) (data page)

Elements

A chemical element, often simply called an element, is a species of atoms which all have the same number of protons in their atomic nuclei (i.e., the same atomic number, or Z).

Notation

The number of protons in the nucleus of an atom is called the atomic number, represented symbolically as Z, and it is a unique characteristic of an element. The mass of an entire atom can be computed from the the sum of the masses of the particles in the nucleus. ...

Number

The number of atoms of ANY substance in a volume is: # of atoms = N * (density) * volume / (Molecular Weight). N is a constant called Avogadro's number and its equal to 6.022*1023 atoms/mole. It can also be molecules per mole.

Centre

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). Atoms have different properties based on the arrangement and number of their basic particles.

Answer 2

Answer:

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.

Explanation:

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