test jan 30

Question 0

what properties do metalloids lack

Answer 0

The properties of metals they are dull brittle and poor conductors

Question 1

Who discovered radioactive decay

Answer 1

Henri Becquerel

Question 2

what are semi conductors

Answer 2

can conduct electricity under some circumstances but not under others

Question 3

what is an Atom

Answer 3

smallest particle of an element

Question 4

what atom model did John Dalton create

Answer 4

the round ball model

Question 5

what atomic model did JJ Thompson discover

Answer 5

blueberry muffin model

Question 6

which atomic model was bohrs

Answer 6

electron cloud

Question 7

Who conducted the famous gold foil experiment

Answer 7

Rutherford

Question 8

James Chadwick discovered what

Answer 8

neutron

Question 9

this model of the Atom describes the center core-nucleus- containing protons and neutrons surrounded by a cloud like region of moving electrons with varying energy

Answer 9

modern atomic model

Question 10

what is atomic mass

Answer 10

The average of all the isotopes of an element

Question 11

Dimitri Mendeleev discovered what

Answer 11

periodic table

Question 12

what is the atomic number

Answer 12

number of protons in the nucleus of the Atom

Question 13

Henry Mosley discovered what

Answer 13

that if elements are arranged in order of increasing atomic number than the elements lined up correctly

Question 14

what are groups or families

Answer 14

vertical columns and periodic table

Question 15

what are the periods

Answer 15

seven horizontal rows and periodic table

Question 16

The modern periodic table is organized by what

Answer 16

atomic number

Question 17

where are metals found on the periodic table

Answer 17

left of the zigzag

Question 18

what are the majority of elements

Answer 18

metals

Question 19

what is malleability

Answer 19

ability to be hammered into thin sheets

Question 20

what is ductility

Answer 20

ability to be drawn into fine wires

Question 21

what is conductivity

Answer 21

ability for heat or electricity to pass through

Question 22

where are the metalloids found on the periodic table

Answer 22

along the zigzag

Question 23

name some properties about the noble gases

Answer 23

they exist in large amounts in the atmosphere, they are chemically unreactive, they are used and glowing electric lights.

Question 24

what is the process in which the atomic nuclei of unstable isotopes release fast-moving particles and energy

Answer 24

radioactive decay

Question 25

becquerel hypothesized that uranium can

Answer 25

spontaneously give off energy or radiation all the time