In the periodic table, atoms are arranged from left to right and from top to bottom in which order?
increasing atomic number
decreasing number of protons
decreasing number of valence electrons
increasing chemical reactivity
In the periodic table, atoms are arranged from left to right and from top to bottom in increasing atomic number. This means that elements with lower atomic numbers are found towards the left side, while elements with higher atomic numbers are found towards the right side.
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The correct answer out of the given options is:
Increasing atomic number
In the periodic table, atoms are arranged from left to right and from top to bottom in order of increasing atomic number.
To understand this order, one needs to know what an atomic number is. The atomic number is defined as the number of protons in an atom's nucleus. Each element on the periodic table is represented by its atomic number.
So, when atoms are arranged from left to right on the periodic table, they are ordered based on increasing atomic numbers. This means that as you move from left to right within a row (period) of the periodic table, the atomic number of the elements increases.
Similarly, when atoms are arranged from top to bottom (vertically), they are organized into groups (or columns) of elements with similar properties due to the same number of valence electrons. However, within each group, the atomic number still increases as you move down.
So, in summary, the periodic table is ordered based on increasing atomic number both horizontally (left to right) and vertically (top to bottom).