L3: Noble gases.

Question 1

when and what did Antoine Lavoisier discover about the periodic table?

Answer 1

1789, he grouped elements as metals and non metals

Question 2

when and what did John newlines discover about the periodic table?

Answer 2

1863, divides the known elements into groups

Question 3

when and what did Mendeleev discover about the periodic table?

Answer 3

1869, created the framework that became the modern periodic table, leaving gaps for elements yet to be discovered

Question 4

what did scientists discover recently about the periodic table?

Answer 4

1999-2009, group of scientists lead by Yuri oganessian, a Russian-armenian scientist discovered 6 elements, flerovium, livermorium, oganesson, moscovium, nihonium, tennessine.

Question 5

where was platinum first discovered?

Answer 5

south america

Question 6

where was carbon first discovered?

Answer 6

Paris, france

Question 7

How many elements are in the modern day periodic table?

Answer 7

118

Question 8

is helium denser than air?

Answer 8

yes

Question 9

What do the noble gases have in common?

Answer 9

They all have complete outer shells

Question 10

how reactive are the noble gases and y?

Answer 10

they r very unreactive (sometimes described as inert, bc outer shell full

Question 11

y is it called group 0?

Answer 11

next shell has 0 electrons

Question 12

what r 3 noble gas properties?

Answer 12

low density, low bp and mp, monatomic gases at room temp

Question 13

what does monatomic mean?

Answer 13

molecule composed of just one atom

Question 14

what does diatomic mean?

Answer 14

molecule w two identical atoms chemically bonded together