Podcast
Questions and Answers
What did Dmitri Mendeleev do in his periodic table in 1869?
What did Dmitri Mendeleev do in his periodic table in 1869?
- Rearranged elements in alphabetical order
- Added only known elements
- Removed elements with wrong properties
- Left gaps for undiscovered elements (correct)
What is the trend in reactivity of the elements in Group 1 as you go down the group?
What is the trend in reactivity of the elements in Group 1 as you go down the group?
- The metals become less reactive
- The metals become progressively more reactive (correct)
- The metals remain neutral
- The metals lose their reactivity
What was the initial challenge faced by scientists in arranging the elements?
What was the initial challenge faced by scientists in arranging the elements?
- They didn't know the atomic number of each element
- They didn't know the properties of each element
- They didn't have a correct periodic table
- They hadn't discovered all the elements yet (correct)
What is the common characteristic of elements in the same group?
What is the common characteristic of elements in the same group?
What happens to the number of shells an atom has as you go down the periods?
What happens to the number of shells an atom has as you go down the periods?
What is the reason why it is easier for group one metals to lose their outer electron as you move down the group?
What is the reason why it is easier for group one metals to lose their outer electron as you move down the group?
What is the common characteristic of compounds made from alkali metals?
What is the common characteristic of compounds made from alkali metals?
Why do the halogens get less reactive as you move down the group?
Why do the halogens get less reactive as you move down the group?
What is the characteristic of alkali metals when they react with water?
What is the characteristic of alkali metals when they react with water?
What is the main difference between the alkali metals and the transition metals in terms of their reactivity?
What is the main difference between the alkali metals and the transition metals in terms of their reactivity?
