For example iron has atomic symbol fe after its latin

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For example, ! Iron has atomic symbol Fe after its Latin name, ferrum . ! Gold has atomic symbol Au after its Latin name, aurum . How to read the periodic table? Let’s take, as an example, Iron 26 Fe 26 is called an atomic number. It denotes the number of protons and, therefore, the number of electrons in iron. At t l! Atoms are neutral! No indication on the number of neutrons! Why? Answer: Chemical element Iron has several its modifications that have different number of neutrons: Iron isotopes Mass Number Natural Abundance Half-life 54 5.845% > 3.1 × 10 +22 years 56 91.754% Stable 57 2.119% Stable 58 0.282% Stable
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5 Mass number is a total number of protons and neutrons in the nucleus. Mass number – atomic number = number of neutrons Atoms with the same number of protons and different number of neutrons are called ISOTOPES. Chemical properties of all elements are determined by the number electrons in their atoms. Structure of Periodic Table Elements are organized by their properties! Why this table is called periodic? A period is a horizontal row A group (or a family) is a vertical column Period or Periodic Trend Across any period, the properties of elements gradually change. This gradual change is called a periodic trend.
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