Structure of the atom
The smallest subatomic particle
Electron
Isotopes of a given element differ in the number of __________.
neutrons
The electronic configuration of 2040Ca.
2, 8, 8, 2
What are the relative charge and relative mass of an electron?
-1 and 1/2000
The element chosen as the standard for determining the relative atomic mass.
Carbon-12 or C-12
Which of these electronic structures belong to of a noble gas?
X 2, 8, 2
Y 2, 8
Z 2, 8, 8, 1
Y
Atoms of different elements have different numbers of these.
Protons
Why do isotopes of the same element have the same chemical properties?
Because they have the same number of outer shell electrons.
An element has an atomic number of 16. Which group is this element located in?
Group VI
(True/False) The elements in the Periodic Table are arranged based on the increasing mass numbers.
False
(True/False) Samples of different isotopes of an element have different chemical properties, but they always have the same physical properties.
False
An atom of element X contains:
● 5 protons
● 6 neutrons
● 5 electrons.
In which group and period is X located?
Group III, second period
Aluminium has an atomic number of 13. How many electrons does aluminium atom have which would be involved in chemical bonding?
3
Boron has two naturally occurring isotopes: B-10 and B-11.The relative atomic mass of Boron is 10.8.
Which isotope is more abundance?
B-11
Nitrogen forms a nitride ion with the formula N3–(atomic number of N = 7).
Which particle does not have the same electronic configuration as the nitride ion?
A. Al3+ (atomic number of Al = 13)
B. Cl– (atomic number of Cl = 17)
C. Na+ (atomic number of Na = 11)
B. Cl–