Just need a short answer Name the two major groups, into which elements can be d
ID: 109488 • Letter: J
Question
Just need a short answer Name the two major groups, into which elements can be divided, with two examples of each. List the three different methods of classifying elements. Write the symbols for the following metals: iron, zinc, mercury, copper and lead. Write down the names of the elements with the following chemical symbols: H, O, S, K, Mg, Ni, Fe, C, Zn, Cu Give two evidences to prove that hydrogen is an element. Name: i. two elements present in the Earth ii. two elements that exist in the liquid state at room temperature. Classify the following as metals and non-metals: copper, sulphur, oxygen, lead, iron, chlorine, nitrogen, hydrogen, mercury, carbon, magnesium, calcium Based on which property are elements classified in the periodic table?Explanation / Answer
3. Name the two major groups into which elements can be divided, with two examples of each?
Answer: The two major groups are:
A. ALKALI METALS: The most reactive group of metals on the periodic table. This group includes all the elements in 1A column of the periodic table. Examples: LITHIUM, SODIUM and POTASSIUM.
B. NOBLE GASES: The most nonreactive group of elements in the periodic table. They are on the extreme right side of the periodic table in group 18. Examples: HELIUM, NEON, ARGON, KRYPTON and XENON.
4. List three different methods of classifying elements?
Answer:
A. Classify whether the elements are metals, nonmetals or metalloids.
B. Identify the elements and find out whether they exist in nature or not.
C. We can classify them according to their state of matter( solid, liquid and gas)
5. Write the symbols for the following metals.
Answer: IRON - Fe, ZINC - Zn, MERCURY - Hg, COPPER - Cu, LEAD - Pb.
6. Write down the names of the elements.
Answer: H - HYDROGEN, O - OXYGEN, S - SULFUR, K - POTASSIUM, Mg - MAGNESIUM, Ni - NICKEL, Fe - IRON, C - CARBON, Zn - ZINC, Cu - COPPER.
7. Give two evidences to prove that hydrogen is an element.
Answer: Hydrogen is the first chemical element in the periodic table. Two evidences: a. It is made up of only one type of atoms, b. Hydrogen atom is the simplest atom and comes in form of gas.
8. i. Name two elements present in the earth?
Answer: SILICON (Si) and IRON(Fe)
ii. Name two elements that exist in the liquid state at room temperature?
Answer: MERCURY (Hg) and BROMINE (Br)
9. Classify the following as metals and non-metals.
Answer:
METALS: Calcium, Magnesium, Iron, Lead.
NON-METALS: Hydrogen, Carbon, Nitrogen, Oxygen, Sulphur, Chlorine.
10. Based on which property are elements classified in the periodic table?
Answer: The periodic table is a organized arrangment of the chemical elements by their ATOMIC NUMBER and Electronic Configuration. Most periodic tables are colour-coded for easy classification of elements.
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