Use the periodic table to answer the question. Which statement correctly compares the valence electrons for atoms of francium (Fr) and barium (Ba)? (1 point) Responses 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 fewer valence electrons, but they are in a higher energy level. Barium 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. 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.
Group 2 elements have two valence electrons. Which kind of bond will they most likely form, and why?(1 point) Responses An ionic bond is likely because they will want to give away two valence electrons in order to become stable. An ionic bond is likely because they will want to give away two valence electrons in order to become stable. A covalent bond is likely because they want to share those two valence electrons in order to become stable. A covalent bond is likely because they want to share those two valence electrons in order to become stable. An ionic bond is likely because they are metals and will want to bond with nonmetals. An ionic bond is likely because they are metals and will want to bond with nonmetals. A metallic bond is likely because they are metals and can bond with other metals
A metallic bond is likely because they are metals and can bond with other metals.
What of the following is an advantage of the thermal properties of plastic?(1 point) Responses The thermal conductivity of plastic is very high, making it a good material to transmit heat. The thermal conductivity of plastic is very high, making it a good material to transmit heat. Heating plastics eliminates the risk of BPA exposure. Heating plastics eliminates the risk of BPA exposure. Plastics are easy to mold into any shape. Plastics are easy to mold into any shape. Plastics are safe to use in microwave ovens
Plastics are easy to mold into any shape.
In one to two sentences, identify the type of model shown and describe the atomic structure of a molecule of water. (2 points)
The model shown is a ball-and-stick model. The atomic structure of a water molecule consists of two hydrogen atoms bonded to one oxygen atom, where the oxygen atom forms a bent shape with a 104.5° angle between the hydrogen atoms.
Moving from the element with atomic number 10 to atomic number 11 on the periodic table, there is a change in reactivity. In three to five sentences, identify the direction of the change, and give two reasons for the change.(4 points)
Moving from the element with atomic number 10 (neon) to atomic number 11 (sodium) on the periodic table, there is a change in reactivity as sodium is more reactive than neon. The change in reactivity is from being relatively non-reactive (neon) to highly reactive (sodium).
Two reasons for this change in reactivity are the difference in their electron configurations and the location of these elements on the periodic table. Neon has a stable electron configuration with a full outer shell of 8 electrons, making it highly stable and unreactive. In contrast, sodium has a single valence electron in its outermost shell and a strong tendency to lose this electron to achieve a stable configuration.
Additionally, sodium is positioned in Group 1 (alkali metals) of the periodic table, a highly reactive group of metals that readily undergoes electron loss to form positive ions. The increase in reactivity moving from neon to sodium is therefore due to the transition from a noble gas (stable electron configuration) to an alkali metal (eager to lose its valence electron and form a positive ion).