8 Flashcards
What is the isotope represented as S-34?
It is an isotope of sodium, has 34 protons, must have exactly 18 electrons, and contains exactly 18 neutrons.
As a sample of a radioactive nuclide decays, what happens to its half-life?
It remains the same.
What are Group 2A elements also called?
Alkaline earth metals.
What are Group 7A elements also called?
Halogens.
How many carbon atoms are in the formula Al2(CO3)3?
6.
How many of each type of atom are there in the formula Ca3(PO4)2?
Ca = 3, P = 2, O = 8.
How many protons and electrons are present in O-2?
8 protons and 10 electrons.
Where are metalloids located on the periodic table?
Zig-zag diagonal line.
Where are metals located on the periodic table?
Left side.
In what way do the atoms of the isotopes of an element differ?
They differ in the number of neutrons.
What are the names of the elements with symbols Si, P, Mn, and S respectively?
Silicon, phosphorus, manganese, and sulfur.
What cannot be said about the nucleus of an atom?
It cannot be said to be electrically neutral.
What determines the chemical properties of an atom?
The number of electrons.
What is the atomic symbol for silver?
Ag.
What is the charge on the ion formed by aluminum?
3+.
What is the charge on the ion formed by selenium?
2-.
What is the correct chemical symbol for mercury?
Hg.
What is the correct formula for a potassium ion with 18 electrons?
K+.
What is the formula mass of copper(II) fluoride?
101.55.
When a nucleus undergoes radioactive decay, what happens to its mass number?
It is always less than its original mass number.
Which formula shows the proper use of parentheses?
(NH4)3(PO4).
Which element has an atomic number of 4?
Be.
Which of the following has the largest formula mass?
SiO2.
Which of the following is NOT a correct name, symbol combination?
Manganese, Mg.
