Periodic Table History and Trends

_______________ developed the first periodic table and arranged the elements in order of increasing atomic mass.

• Stevie Wonder
• Sasha Vujacic
• Dmitri Mendeleev
• James Mosely

What was Dmitri Mendeleev's greatest contribution to the history of the periodic table?

• He arranged all of the known elements by their atomic number
• He realised that there was a pattern of reactivity which repeated every 8 elements
• He predicted the existence (and properties) of new elements
• He identified the "law of triads" which became the groups

Vertical columns of elements (these are also known as a "family") - they also have the same number of valence electrons and are known as ________________.

• groups

• periods

• quadrants

• rows

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Which two elements on the periodic table are in the same period?

• Sn and Rb

• K and Ba

• F and Cl

• Se and Te

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The horizontal rows on the periodic table, which indicate the number of energy levels/orbitals that an atom has, are called ___________.

• Periods

• Element

• Atomic Number

• Group

Which of the following will have a higher electronegativity than arsenic (As)?

• Carbon (C)
• Neon (Ne)
• Antimony (Sb)
• Germanium (Ge)

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Which of the following will have a lower ionization energy than Scandium (Sc)?

• Helium (He)
• Titanium (Ti)
• Calcium (Ca)
• Magnesium (Mg)

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Which atom has the largest atomic radius?

• potassium
• rubidium 
• francium
• cesium

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As you move across the periodic table atoms tend to get smaller because, ______________.

• the atoms have more mass.
• the atoms have less mass
• the atoms have more protons.
• the atoms have less electrons.

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The atom with the largest atomic radius in Group 18 is - 

• Ar
• He
• Kr
• Rn

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