what do elements in a group on the periodic table have in common?\nthey have the same atomic mass.\nthey…

what do elements in a group on the periodic table have in common?\nthey have the same atomic mass.\nthey have the same number of neutrons in the nucleus.\nthey have similar chemical properties.\ntheir valence electrons have the same energy level.\nquestion 2 (5 points)\nlisten\naluminum has an atomic number of 13 and an atomic mass of 26.98. how many protons, neutrons, and electrons are in an aluminum atom?\n26 protons, 26 electrons, 14 neutrons\n13 protons, 13 electrons, 13 neutrons

what do elements in a group on the periodic table have in common?\nthey have the same atomic mass.\nthey have the same number of neutrons in the nucleus.\nthey have similar chemical properties.\ntheir valence electrons have the same energy level.\nquestion 2 (5 points)\nlisten\naluminum has an atomic number of 13 and an atomic mass of 26.98. how many protons, neutrons, and electrons are in an aluminum atom?\n26 protons, 26 electrons, 14 neutrons\n13 protons, 13 electrons, 13 neutrons

Answer

Brief Explanations:

  1. Elements in the same group of the periodic table have the same number of valence electrons, which leads to similar chemical properties. Atomic mass varies among elements in a group. Neutron - number is not the same for elements in a group. Valence - electrons are in different energy levels as we move down a group.
  2. The atomic number of an element is equal to the number of protons and in a neutral atom, the number of electrons is equal to the number of protons. The number of neutrons is calculated as atomic mass (rounded) - atomic number. For aluminum with atomic number 13, the number of protons is 13 and the number of electrons is 13. The atomic mass is 26.98 (rounded to 27), so the number of neutrons is 27 - 13=14.

Answer:

  1. They have similar chemical properties.
  2. 13 protons, 13 electrons, 14 neutrons