Pre-Test
electron arrangment in russian
распределение электронов
If an atom has 15 protons and 18 electrons, what is the net charge of the resulting ion?
-3
What are the three primary subatomic particles found in an atom, and what are their respective charges?
Answer: B. Proton (+1), Electron (-1), Neutron (0)
The sum of protons and neutrons and electron are atomic mass of element. True or False
False
protons are located inside of the nucleus. True or False?
True!
The charge of the proton is ____________ but th?e charge of the electron is ____________.
Positive, negative
In the chemical formula Na2S, the subscript "2" indicates:
The number of Sodium atoms in the molecule
The numbers of electrons and protons are ____________ in the neutral atom.
equal
The formula of Atomic Mass (A) =
Protons + Neutrons
the atomic number of an element determined by the number of
Protons in its nucleus.
How many electrons does the fourth energy level (n=4) of an atom hold at most?
32 electrons
If an atom has 13 protons in the nucleus, how many electrons will surround the nucleus?
13
The numbers of electrons and protons are ____________ in the ionic atom
Different
Which of the following elements is more likely to form a cation? A. Oxygen (O) B. Sodium (Na) C. Chlorine (Cl) D. Neon (Ne)
B Sodium because it metal
Atoms of different elements have different numbers of these.
The answer is: B. Protons
What is the mass number of an atom with 26 protons, 30 neutrons and 26 electrons?
the mass number of the atom with 26 protons, 30 neutrons, and 26 electrons is 56.
This is the smallest subatomic particle.
The smallest subatomic particle is the "quark."
Lost electrons and have a negative charge its about anion. Its true?
No its false
An atom with the same number of protons but different number of neutrons.
isotope
An ion of nitrogen has a charge of -3. How many protons and electrons do the ion have?
the ion of nitrogen with a charge of -3 has 7 protons and 10 electrons.