ATOM Flashcards
(16 cards)
What is the atom?
it’s the fundamental building unit of the matter
construction of atom
nucleus and electrons
g.r the nucleus is positively charged and the atom is neutrally
b.c it contains positive protons and neutral neutrons and the atom has positive protons equal to the negative electrons
mass number and atomic number
It is the sum of protons and neutrons in the atom
above. It is the number of protons in the atom below
energy level
its imaginary levels that are the electrons around the nucleus in this orbits
quantum
It is the amount of energy that the atom gains or loses ad the atom
excited atom
its the atom that gains an amount of quantum
. w.h when the atom gains energy
the atom changes from its ordinary energy level to a higher energy level and the atom becomes an excited atom
.w.h when the atom loses energy
the atom returns to its ordinary state(energy level).
the relation 2n2 is not suitable after 4 e.n
b.c When the atom has more than 32 electrons the atom becomes unstable atom
the active elements take part in the chemical process
to produce stable atom
the inactive elements don’t share in the chemical reactions
b.c the outermost energy level is completely filled with electrons
the mass of the atom is concentrated in the nucleus
b.c the electron has a negligible (very tiny ) relative or compared to the protons and neutrons
the mass no. is always larger than or equal to the atomic number
b.c the mass no. equal the sum of protons and neutrons in the nucleus but the atomic no. equal the number of protons only
what is meant by
the atomic number of calcium atoms equals 20
the mass number of calcium atoms equals 40
the number of protons in the nucleus equals 20
the sum of the numbers of protons and neutrons in the nucleus equals 40
