Which two groups of elements in the periodic table are the most reactive?(1 point)Responsesnoble gases and alkali metalsnoble gases and alkali metalsalkali metals and halogensalkali metals and halogenshalogens and noble gaseshalogens and noble gasesalkaline earth metals and halogens
The Periodic Table Quick Check2 of 52 of 5 ItemsQuestionUse the periodic table to answer the question.An illustration shows the periodic table.Which statement about nitrogen (N) and phosphorus (P) is correct?(1 point)ResponsesThey have the same number of electron shells.They have the same number of electron shells.They are both inert.They are both inert.They have the same number of valence electrons.They have the same number of valence electrons.They are both classified as halogens.They are both classified as halogens.Skip to navigation
They have the same number of valence electrons.
Which property do transition metals have in common?(1 point)ResponsesThey usually have high melting points.They usually have high melting points.They are usually very soft.They are usually very soft.They are usually very reactive.They are usually very reactive.They usually have low densities.They usually have low densities.
They usually have high melting points.
QuestionNeon and argon are both in Group 18 of the periodic table. Which property do they most likely share?(1 point)Responsesstrong odorstrong odorsilver colorsilver colorlow or no reactivitylow or no reactivitymetallic texture
low or no reactivity
The Periodic Table Quick Check5 of 55 of 5 ItemsQuestionA scientist studies an element that has seven electrons in its outer shell, is fairly toxic, is a gas at room temperature, and is highly reactive. To which group of the periodic table does this element belong?(1 point)Responses2 - alkaline earth metals2 - alkaline earth metals18 - noble gases18 - noble gases17 - halogens17 - halogens1 - alkali metals
