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There are 12 such elements and they are hydrogen, helium, lithium, beryllium, boron, carbon, nitrogen, oxygen, fluorine, neon, sodium and magnesium.

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Which element has an atomic number lower than aluminum and is in group 15?

The element with an atomic number lower than aluminum and in group 15 is phosphorus. It has an atomic number of 15, which is lower than aluminum's atomic number of 13.


Has similar properties with elements T but has lower atomic number?

Element S has similar properties to element T but has a lower atomic number.


This element is in group 1 and has a higher atomic number than chlorine but lower atomic number than bromine?

Examination of a periodic table shows that the element is potassium.


The number to the lower right on an element symbol indication the number of atoms of that element?

The number to the lower right on an element symbol is the atomic number, representing the number of protons in the nucleus of an atom of that element. It does not indicate the number of atoms of that element in a compound; that information is conveyed through subscript numbers next to the element symbol in a chemical formula.


What is smaller than the atomic radius of beryllium (Be)?

Generally, any element with a lower atomic number.


What element in group one has a higher atomic number than chlorine but lower atomic number than bromine?

The element in group one with a higher atomic number than chlorine but lower atomic number than bromine is iodine. Its atomic number is 53, which is greater than chlorine's atomic number of 17 but less than bromine's atomic number of 35.


What element is in group 1a and higher atomic number than chlorine but lower number than bromine?

The element in Group 1A with a higher atomic number than chlorine but lower than bromine is iodine.


This element is in group 1 and has a higher atomic number than chlorine but a lower atomic number than bromine?

potato


How can the atomic mass of the element be lower than the element that came before it?

Because the periodic table is organized by atomic number, not by atomic mass. The general trend in the periodic table is a higher atomic mass as you go up atomic number, but there are exceptions.


The number of present will determine the atomic number of an element?

The atomic number is determined by the number of protonsin the nucleus of the atom.The atomic number is conventionally written to the lower left of the chemical symbol for the element, e.g. for oxygen and for copper:8O 29Cu


Element with similar properties with chlorine but has lower atomic number?

You think at fluorine (F).


This element is in group 1 and has a high atomic number than chlorine, but a lower?

chlorine