Noble gases were included in Mendeleev’s periodic table in the1st group7th group8th groupNone of these

ue with Mendeleev's 1871 Periodic Table:First Issue:Noble gases were not included because they hadn't been discovered yet.Second Issue:Pairs of elements (e.g., Co and Ni) didn't fit into groups as expected based on their properties when arranged by atomic masses.Reason for Discrepancy:Later discovery of isotopes, different forms of an element with varying neutron numbers.Understanding Isotopes:Atomic mass of an element is an average of its isotopes' masses, considering their relative abundances.Impact on Mendeleev's Arrangement:

What group of the periodic table are the noble gases found in?Group 2Group 0Group 1Group 72Which of the following is not a property of the noble gases?They are colourlessThey have high boiling pointsThey exist as single atomsThey do not form molecules3Which is the best explanation for why the noble gases are unreactive?They all have low boiling pointsThey are all gasesThey all have full outer electron shellsThey are all large atoms4Which noble gas has the following electronic structure: 2, 8, 8?HeliumKryptonNeonArgon5The boiling point of helium is -269°C, while that of argon is -185.8° Predict the boiling point of neon:-275°C-246°C-269°C-176°C

What is the name for Group 8 on the periodic table?AAlkali MetalsBTransition MetalsCHalogensDAlkaline Earth MetalsENoble Gases

Mendeleev’s Periodic Table consists of ‘X’ horizontal rows called periods and ‘Y’ vertical columns called groups. ‘Y’ and ‘X’ respectively are7 and 68 and 77 and 86 and 7

What was the main drawback of Mendeleev's periodic table?Many elements have several isotopes.Noble gases do not form compounds.Some groups stand divided into two sub groups A and B.Atomic weights of elements are not always whole numbers.