Q: Who is credited with the development of the periodic table?

A: Dmitri Mendeleev

Q: What was the basis for Mendeleev's periodic table?

A: Atomic mass

Q: How did Mendeleev arrange the elements in his periodic table?

A: In order of increasing atomic mass

Q: What did Mendeleev leave gaps for in his periodic table?

A: Elements that were yet to be discovered

Q: What additional information did Mendeleev include in his periodic table?

A: Properties of the elements

Q: How did Mendeleev predict the properties of the missing elements?

A: By analysing the trends and patterns of the known elements

Q: Who is credited with the modern periodic table?

A: Henry Moseley

Q: What is the basis for the modern periodic table?

A: Atomic number

Q: How is the modern periodic table arranged?

A: In order of increasing atomic number

Q: What did the modern periodic table resolve?

A:Anomalies in the arrangement of elements based on atomic mass

Q: How many periods are there in the modern periodic table?

A: 7 periods

Q: How many groups are there in the modern periodic table?

A: 18 groups

Q: What are the elements in group 1 of the periodic table called?

A: Alkali metals

Q: What are the elements in group 7 of the periodic table called?

A: Halogens

Q: What are the elements in group 0 of the periodic table called?

A: Noble gases