Answer 1) Electrons - Negatively charged, subatomic particles.
Explanation : Electrons are one of the subatomic particles in the atomic nucleus. Which is negatively charged and revolves around the nucleus in defined circular path. It is of the same number as that of protons but are opposite in charges.
Answer 2) Metals - Elements that are malleable, polish to a luster, conduct heat and electricity well and tend to lose electrons in a chemical reaction.
Explanation : Metals are those elements which usually exists on the left side of the periodic table. They are malleable in nature. They posses luster as a property. They are good conductors of heat and electricity. It is found that they tend to lose electrons in a chemical reaction.
Answer 3) Period - They are the horizontal rows in the modern periodic table.
Explanation : In the modern periodic table of elements, there are seven horizontal rows of elements called periods. In these periods the atomic numbers increases from left to right. Elements placed in the same period are observed to have different chemical properties.
Answer 4) Compound - two or more elements that have chemically combined.
Explanation : Compound are those which are formed by combining different elements through chemical methods. Generally, It is very difficult to separate the compounds.
Answer 5) Solution - A homogeneous mixture whose particles are too small to reflect or scatter light.
Explanation : A solution is a homogeneous mixture which is uniformly distributed solute particles in the solvent. It contains particles which are too small to reflect or scatter the incident light.
Answer 6) Protons - Positively charged, subatomic particles found in the nucleus of the atom
Explanation : Protons are considered to be the subatomic particles which are at the center of the nucleus of the atom and are positively charged. It has same number of electrons in the atom but in opposite charges.
Answer 7) Group - A vertical column on the periodic table
Explanation : Groups are the vertical columns in the modern periodic table. There are in all 18 numbered groups in the modern periodic table, and the f-block columns (between groups 3 and 4) are not numbered in this. Elements belonging to the same group are observed to have similar chemical properties.
Answer 8) Metalloids - Elements with properties intermediate between those of metals and nonmetals
Explanation : Metalloids tend to have a metallic appearance in them, but they are seen to be brittle in nature and only fair conductors of electricity. Most of them behave as non-metals chemically. They are observed to be good alloys in the metals. Their properties are intermediate between the metals and non-metals.