6. Which answer best describes the size of the nucleus
The nucleus is almost the whole mass of he atom, but size- wise it is tiny compared to the atom as a whole.
The nucleus is extremely small.
Tiny
Very big nearly whole size of the atom
7. Which of these are classed as elements?
Aluminium and hydroxide.
copper, Aluminium, iron, oxygen and nitrogen.
potassium chloride, metal halide and magnesium bromide.
All of the above.
8. What is an isotope?
different atomic forms of the same element with the same number of electrons and different number of protons
isotopes are scientific formulas used to explain the mass of elements
ifferent atomic forms of the same element, which have the same number of protons but different numbers of neutrons.
Lots of elements
9. Name a popular set of isotopes
carbon 12 and Carbon 14
nitrogen 2 and nitrogen 3
potassium permanganate 6 potassium permanganate 8
10. TRUE/ FALSE - In the 1800s chemists were keen to try and find patterns in the elements that they knew about.
True
False
11. TRUE/ FALSE - The periodic table was made by mendeleev in 1804 after a lot of effort
False
Tue
12. The Mass number - atomic number =
Atom mass
16
The number of neutrons.
The amount of protons in the nucleus.
13. TRUE/ FALSE/partially - Before mendeleev's discovery scientists had no idea about the structure of atoms, but they could measure the relative atomic mass of each element.
True
False
was false but then it became true
not sure
14. What does the nucleus contain?
oxygen and nitrogen
electrons
Protons and neutrons
nucleus
15. Name one thing you cannot do with an element?
Building material
You can’t convert one type of element into another using chemical reactions.
Not sure?
use in cars
16. What would happen if isotopes had a different number of protons?
If they had a different number of protons, they’d be different elements altogether.
it will be a unique isotope called istopiside
It would form a covalent bond as it is
17. What is the atomic number?
The number of protons and electrons.
number of neutrons.
Another name for the mass number of an atom.
proton weight.
Not sure?
18. Which points best explain what the electrons are?
Electrons move around the atom. They are he same size as the nucleus. They have a lot of mass.
They have a negative charge. They have virtually no mass. They occupy shells (energy levelaround the nucleus. Electrons follow the configuration 2,8,8.
electrons are another version of protons. They are extremely small. The follow the configuration rule of 2,8,8.
