All Categories
Periodic Table of Elements
Explore questions in the Periodic Table of Elements category that you can ask Spark.E!
- The low ____________ of helium make blimps and weather balloons float.
- Halogens combine with most metals to form __________, such as __________________.
- Horizontal rows of elements on the periodic table are called ______________.
- Which element is a brittle solid with low conductivity at STP?1) sulfur2) sodium3) argon4) aluminium
- Vertical columns of elements on the periodic table are called __________ or ______________.
- What are three compounds of carbon that are necessary for living things on Earth?
- The number of ____________ in the outer energy level of an atom helps determine which category an element belongs in.
- Most elements are are ______, which can be found to the left of the zigzag line on the periodic table.
- Which lanthanide forms a compound that enables you to see red on a computer screen?
- What are two products made from calcium compounds?
- Which of the following characteristics does NOT describe transition metals?A. They are good conductors of thermal energy.B. They are more reactive than alkali and alkaline-earth metals.C. They have one or two electrons in the outer energy level.D. They are denser than elements in Groups 1 and 2.
- The physical and chemical properties of the elements change __________.
- Atoms of _____________ have two outer-level electrons.
- For most elements, the _________ has one or two letters, with the first letter always capitalized.
- Semiconductors, also called __________, are elements that border the zigzag line on the periodic table.
- Metals that are less reactive than alkali metals and alkaline-earth metals are called_______________.
- Which ion has the smallest radius?1) O2-2) S2-3) Se24) Te2-
- What metal is flattened into sheets to make cans and foil?
- The metalloids __________ and ______ both in Group 14, are used to make computer chips.
- When the repeating chemical and physical properties of elements change periodically with the elements' atomic numbers, it is called the __________________.