What is the relative charge of a proton?
Zero
-1
+1
What is the relative mass of an electron?
1
1/5000
1/1840
The number of protons (p), electrons (e) and neutrons (n) in an atom of 23Na is:
11p, 11e and 11n
11p, 11e and 12n
12p, 12e and 11n
The number of electrons in the nitride ion N3- is:
7
14
10
The electronic configuration for a calcium atom 40Ca is:
2,8,8,2
2,8,18,12
2,8,10
The relative charge on a neutron is:
0
Which of the following statements is the definition for atomic number?
The number of protons in an atom.
The number of protons and neutrons in an atom.
The number of protons and electrons in an atom.
Which of the following statements is the definition for mass number?
Which particles are found in the nucleus of an atom?
Electrons and protons.
Neutrons and electrons.
Protons and neutrons.
The number of electrons in a potassium ion K+ is:
18
19
20