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Answer:
WORKSHEET NUMBER 1
1) Dmitri Mendeleev arranged the periodic table in february of 1869
2)Atomic Number: the number of protons in the nucleus (which is the same as the number of electrons in the atom). Name: the element's common name. Symbol: a one or two letter symbol that represents the element.
3) For all atoms with no charge, the number of electrons is equal to the number of protons. The mass number, 40, is the sum of the protons and the neutrons. To find the number of neutrons, subtract the number of protons from the mass,
The formula to calculate the number of
neutrons is given by M-Z.
Where M is the mass number of the atom,
The mass number of an atom is the sum of the number of protons and the number of neutrons.
Z is the atomic number of an atom, The atomic number of an atom gives the number of protons.
4) The number of protons and the number of neutrons determine an element's mass number:
mass number = protons + neutrons.
5) •Electrons are a type of subatomic particle with a negative charge. •Protons are a type of subatomic particle with a positive charge. Protons are bound together in an atom's nucleus as a result of the strong nuclear force. •Neutrons are a type of subatomic particle with no charge (they are neutral).