Why do you think the helium atoms approach each other? be sure to include descriptions of relevant subatomic particles and forces.)

5) Which of the following gases exists as a diatomic molecule? A) krypton C) hydrogen B) argon 6) Which statement is correct about chlorine-35 and chorine-37 ? A) They have a different number of protons and electrons, but the same number of neutrons. B) They have the same number of protons and electrons, but a different number of neutrons. C) They have the same number of protons, but a different number of electrons and neutrons 7) Using the periodic table, what is the atomic number of argon? A) 18 B) 39.95 C) 13 8) What kind of formular is C,H,0, consider as? A) Empirical formula C) Confensed formua B) Moleculr formula 9) Who provided evidence for the existence of a nucleus in an atom? A) John Dalton C) Ernest Rutherford B) J.J. Thomson 10) Which statement about subatomic particles is NOT true? A) Protons and neutrons have the same charge B) Protons and neutrons have almost the same mass C) Protons and electrons have opposite charges 11) To calculate the number of neutrons in an atom,…

1. Describe briefly, indicating the scientist responsible, experiments that gave the following evida,riee7RT¬the model of an atom:a) The atom consists of a very tiny, thickly dense positively charged nucleus, surrounded by a negatively charged electron cloud.b) The nucleus contains a specific number of protons, positively charged particles that gives the atomic number.c) Neutrons together with the protons in the nucleus account for the atomic weight.

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Element Q has an atomic number 113. Consider the isotope Q-222. How many neutrons are in a neutral atom of this isotope?

[Reforences) A monatomic ion has a charge of +2. The nucleus of the ion has a mass number of 86. The number of neutrons in the nucleus is 1.26 times that of the number of protons. How many electrons are in the ion? electrons What is the name of the element?

Two different atoms have nine protons each and the same mass

Mendeleev left empty spaces in his periodic table for elements he suspected existed but had yet to be discovered. He left no spaces for the Noble gases that we now have in the modern periodic table.  Give at least two reasons on why this group was challenging to discover, based on what we now know about the atom including sub-atomic particles. Mendeleev had a group VIII but they are NOT the noble gases.