What is the periodic table?
Q: What is the periodic table?
A: The periodic table is a chart that arranges all known chemical elements in order of their atomic numbers, starting with hydrogen at number one. Elements with similar characteristics are often placed near each other.
Q: How many periods and groups are there in the standard periodic table?
A: There are 8 periods and 18 groups in the standard periodic table.
Q: What do elements in a period have in common?
A: Elements in a period have consecutive atomic numbers.
Q: What do elements in a group have in common?
A: Elements in a group have electrons arranged similarly, according to the number of valency electrons, which gives them similar chemical properties.
Q: Who invented the periodic table?
A: The Russian chemist Dmitry Ivanovich Mendeleyev invented the periodic table (1834–1907).
Q: What are the three main groups on the Periodic Table?
A: The three main groups on the Periodic Table are metals, metalloids, and nonmetals.
Q: How can patterns and relationships between elements be observed using the Periodic Table?
A: Patterns and relationships between elements can be observed by looking at where they appear on the Periodic Table; for example, elements to bottom left of it tend to be more metallic than those on top right.
