Based on properties of elements in the periodic table, which element is the best conductor of thermal energy? (1 point) Responses germanium (Ge) germanium (Ge) argon (Ar) argon (Ar) polonium (Po) polonium (Po) vanadium (V)
Polonium (Po)
Which statement best explains why hydrogen’s atomic number is equal to its mass?(1 point) Responses Hydrogen does not have any neutrons. Hydrogen does not have any neutrons. Hydrogen is stable, with two electrons in its outer shell. Hydrogen is stable, with two electrons in its outer shell. Hydrogen is in the first row and the first column of the periodic table. Hydrogen is in the first row and the first column of the periodic table. Hydrogen only has one electron
Hydrogen only has one electron.
Which statement correctly compares the valence electrons for atoms of francium (Fr) and barium (Ba)? (1 point) Responses Francium has more valence electrons, and they are in a higher energy level. Francium has more valence electrons, and they are in a higher energy level. Francium has fewer valence electrons, but they are in a higher energy level. Francium has fewer valence electrons, but they are in a higher energy level. Barium has more valence electrons, and they are in a higher energy level. Barium has more valence electrons, and they are in a higher energy level. Barium has fewer valence electrons, but they are in a higher energy level.
Francium has one valence electron, while barium has two valence electrons. Therefore, barium has more valence electrons, but they are in a higher energy level. The correct statement is: Barium has more valence electrons, but they are in a higher energy level.
Gallium has an atomic number of 31 and a mass number of 70. Which table shows the number of protons, neutrons, and electrons in a gallium ion with a +3 charge?(1 poin
To determine the number of protons, neutrons, and electrons in a gallium ion with a +3 charge, we need to subtract the charge from the atomic number and mass number.
The atomic number of gallium is 31, so it has 31 protons.
The mass number of gallium is 70, so it has 70 neutrons.
To determine the number of electrons, we need to consider the charge. A +3 charge means that the ion has lost 3 electrons. Since neutral gallium has 31 electrons, a +3 ion would have 31 - 3 = 28 electrons.
Therefore, the table would show:
Protons: 31
Neutrons: 70
Electrons: 28