Choose the correct answers about the electron cloud:
Respuesta
It is the internal part of the atom
It has got the negative charge of the atom
It has got protons spinnng in orbits
It is the external part of the atom
It has got electrons turning in orbits
Pregunta 4
Pregunta
All atoms have the same [blank_start]internal[blank_end] structure made up of: the [blank_start]nucleus[blank_end], very [blank_start]smalll[blank_end] compared to the size of the atom and the [blank_start]electron[blank_end] [blank_start]cloud[blank_end], the external area of the atom which is much larger than the [blank_start]nucleus[blank_end].
Respuesta
internal
nucleus
smalll
electron
cloud
nucleus
Pregunta 5
Pregunta
The Atomic Theory was admitted in 1904.
Respuesta
True
False
Pregunta 6
Pregunta
Dalton in [blank_start]1808[blank_end] said that atoms of the same [blank_start]elements[blank_end] had identical properties and those of [blank_start]different[blank_end] elements are different. [blank_start]Thomson[blank_end] in 1904, designed an atomic model where [blank_start]electrons[blank_end] were incrusted in a [blank_start]positive[blank_end] sphere. Rutherford in [blank_start]1911[blank_end] drew an atomic model were the nucleus had got almost all the [blank_start]mass[blank_end] of the atom and all the [blank_start]positive[blank_end] charge, and he added [blank_start]electrons[blank_end] in an electron cloud where it was located the [blank_start]negative[blank_end] charge. In 1913 [blank_start]Bohr[blank_end] specified the [blank_start]orbits[blank_end] in the electron cloud and he detailed how [blank_start]electrons[blank_end] moved in them.
Respuesta
1808
1904
1911
1540
compounds
elements
systems
protons
similar
the same
metallic
different
Dalton
Rutherford
Thomson
Bohr
electrons
neutrons
protons
nucleus
neutral
negative
circular
positive
1904
1911
1915
1880
charge
clouds
electrons
mass
positive
negative
neutral
espherical
protons
electrons
neutrons
elements
positive
neutral
whole
negative
Rutherford
Bohr
Thomson
Dalton
orbits
roads
droplets
thickness
protons
things
electrons
neutrons
Pregunta 7
Pregunta
Marie Curie was born in Russia
Respuesta
True
False
Pregunta 8
Pregunta
At the beginning of the 19th century 75 chemical elements were known.
The periodic table contains [blank_start]118[blank_end] elements ordered by their [blank_start]atomic[blank_end] number. The system is divided into:
- [blank_start]seven[blank_end] rows called [blank_start]periods[blank_end]
- [blank_start]eighteen[blank_end] columns, called [blank_start]groups[blank_end] or families. Elements which belong to the same group have got [blank_start]similar[blank_end] chemical properties.
We can distinguish four general types of elements:
- [blank_start]Metals[blank_end]: They are electricity and heat conducted. They are in [blank_start]solid[blank_end] state except Mercury.
- Semimetals: Their behaviour is [blank_start]metallic[blank_end] or [blank_start]non metallic[blank_end] depending on the conditions.
- [blank_start]Non-metals[blank_end]: They are heat and electricity bad conducted. They are in solid, gas and liquid state.
- [blank_start]Noble gases[blank_end]: They do not combine with other chemical elements.