What do the numbers on an element represent?

What do the numbers on an element represent?

The atomic number is the number of protons in the nucleus of an atom. The number of protons define the identity of an element (i.e., an element with 6 protons is a carbon atom, no matter how many neutrons may be present).

What does the number at the bottom of each block on the periodic table represent?

For s-block elements, the group number is the number of valence electrons. for p-block elements, the group number is 10 plus the number of valence electrons. For d-block elements, the group numbers is (n-1) the number of electrons in the subshell plus the number of electrons in the valence shell.

Which has the lower atomic number?

The element with the lowest atomic number is hydrogen. Hydrogen has an atomic number of 1, regardless of which hydrogen isotope we have.

What does the subscript number to the left of an element’s symbol indicate?

The atomic number is written as a subscript on the left of the element symbol, the mass number is written as a superscript on the left of the element symbol, and the ionic charge, if any, appears as a superscript on the right side of the element symbol. If the charge is zero, nothing is written in the charge position.

Which of the following elements has the lowest atomic mass?

hydrogen
Detailed Solution. The lowest atomic mass of the elements is hydrogen. The Atomic Mass is the sum of the mass of protons and neutrons present in the atom of the element. The atomic mass of hydrogen is 1 unit, Helium is 2 units, Lithium is 3 units and that of Nitrogen is 7 units.

What does an element’s atomic weight determine?

The total weight of an atom is called the atomic weight. It is approximately equal to the number of protons and neutrons, with a little extra added by the electrons. The stability of the nucleus, and hence the atom’s radioactivity, is heavily dependent upon the number of neutrons it contains.

What is the number on the bottom left of an element?

The atomic number of an element tells you how many protons that the element has. This is written at the bottom left hand side of the symbol.

Is neutrons on top or bottom?

This number corresponds to the number of protons plus the number of neutrons. Use the top left to find the number of neutrons. We see that our atom has 2 protons, so we just subtract: 4 – 2 = 2 neutrons. The upper right corner has to do with charge and number of electrons.

What does the superscript 24 indicate?

Answer: superscript 24 indicates atomic weight. subscript 12 indicates atomic number.

What is the lower left number on a chemical symbol?

The number below the symbol is the atomic number and this reflects the number of protons in the nucleus of each element’s atom. Every element has a unique atomic number. Lead has 82 protons therefore its atomic number is 82.