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Answer:
0I-1. and 2. The horizontal rows are known as periods and vertical columns in the periodic table are known as groups.
3. alkali elements
4.The two rows of elements present at the bottom of the periodic table are called the 4f series or lanthanoids and 5f or actanoids. They are also called inner transition elements.
5.The period 6 transition metals are lanthanum (La), hafnium (Hf), tantalum (Ta), tungsten (W), rhenium (Re), osmium (Os), iridium (Ir), platinum (Pt), gold (Au), and mercury (Hg). Hope it helps you.
6.two
7.Elements belonging to the second period of the periodic table are also known as bridge elements. These elements relate to the third-period elements due to similar chemical and physical properties.
8.6th and 7th periods are longest elements
9.The seventh period of the Periodic Table is incomplete.
10.Zero group elements (inert gases) are called noble gases.