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How was atomic number arranged in a periodic table?
The atomic number of an element is how many protons is in it. So the chart is arranged lowest atomic number to highest.
What is the reactivity for the halogens?
The reactivity of halogens decreases with increasing atomic number.
What are the most reactive elements?
That would be the element with the highest atomic number but the lowest number of valence electrons.
What element has the lower atomic number of any group?
Lithium is the element with the lowest atomic number in Group 1 (alkali metals), while hydrogen is the element with the lowest atomic number in Group 17 (halogens) and Group 18 (noble gases).
Can elements be ordered by there atomic number?
Yes, elements can be ordered by their atomic number. The atomic number of an element corresponds to the number of protons in an atom's nucleus, and elements are arranged in the periodic table from lowest to highest atomic number.
Which metal has the lowest atomic number?
Hydrogen is a non metal element. Atomic number of it is 1. It is the element with lowest atomic number.
What is the lowest atomic number actinide?
The lowest atomic number actinide is actinium, with the atomic number 89.
What are the names and atomic numbers of the halogens?
Fluorine = 9 Chlorine = 17 Bromine = 35 Iodine = 53 Astatine = 85
What trends the periodic table should be expected as the atomic number decreases in the halogens?
Halogens with lower atomic number are more reactive and less dense. Also iodine is solid, bromine liquid and the first halogens are gases.
Which element has the highest atomic number?
The element with the highest atomic number is Oganesson, with the atomic number 118.
Lowest atomic number actinide?
Hydrogen is a none metal element. atomic number of it is 1.
What element has the lowest atomic number in period 3?
The element with the lowest atomic number in period 3 is sodium (Na) with an atomic number of 11.
