Periodic Table:In a periodic table, the horizontal rows are named as periods and the vertical columns are named as groups. These rows and columns have made the study of different existing elements very easy.Answer and Explanation: In the arrangement of elements existing in the periodic table, ...
What formal term is applied to (a) the horizontal rows of the periodic table, and (b) the vertical columns? Why are chemists so interested in the number of valence electrons in atoms? Which pair of elements do you expect to be most similar? Why? a)...
Why do chemists classify reactions? Explain why noble gases are usually referred to as inert gases. Why does a dye with lower molecular weight diffuse faster? What are the two ways to define an atomic radius? Describe both ways, and when is each method used?
What was the importance of Mendeleev's periodic table to chemists? How can you find atomic number from mass number? How do you calculate atomic mass from atomic number? Why is the electronegativity of an element important? Why are valence electrons important?
When you mix two compounds, the melting point of the compound is lowered, but the boiling point is elevated. Explain why. Why do metals only form ionic compounds while metalloids and nonmetals form ionic and covalent compounds? what are two reasons that organic chemists measure the ...
The chalcogen group is group 6A of the periodic table of elements. This group can be found on the p-block and at the right side of the periodic table, to the left of the halogens. The only two chalcogens that are nonmetals are oxygen and sulfur...
Why is photosynthesis important to the biosphere? How has organic chemistry changed the world? a. Why do organic chemists use thin-layer chromatography (TLC) to assess the purity of a compound? b. What properties of a compound does TLC depend on? c. What are its advantages? Why are change...
Why we use a number of antimony-bismuth couples in a thermopile? Seebeck Effect German physicist Seebeck identified a potential difference across the ends of a conductor when the ends of the conductor are maintained at different temperatures. The free electrons at the hotter end of the conductor ...
Why do chemists classify reactions? Why are reactions between ions in an aqueous solution generally much faster than reactions between covalent molecules? Why do covalent compounds not conduct electricity? Why is energy released when bonds are formed? Give reasons why most of the compo...
The present form of periodic table is helpful to the students of chemistry in a way that they can corelate or compare the different properties of different elements from this table and they can actually study the elements properly from this table....