CHEMISTRY TEST

Which statement about atom is correct ?

• Atom contains proton and electrons in the nucleus

• Neutron are negatively charged

• Proton are positively charged

• The nucleon number is the number of neutron

Which row shows the correct properties of an electron ?

• A

• B

• C

• D

How many protons, neutrons, and electrons are there in an atom of lithium respectively ?

• 3, 4, 3

• 3, 7, 3

• 3, 7, 4

• 3, 4, 4

An atom of elemen X contains :

9 protons

10 neutrons

9 electrons

Which statement about element X are correct ?

1. 1. X has an atomic number of 10

2. 2. X has a nucleon number of 19

3. 3. X is in the third period of the periodic table

4. 4. X is in group VII of the periodic table

• 1 and 3

• 1 and 4

• 2 and 3

• 2 and 4

How many protons does this element have ?

• 6

• 11

• 13

• 17

Which statement describes isotopes of the same element?

• They have different electron arrangements.

• They have different nuclear charges.

• They have nuclei with masses that are the same

• They have the same number of protons

Carbon-12 and carbon-14 are isotopes.

Which statement describes isotopes?

• Atoms with the same number of protons but a different number of electrons.

• Atoms with the same number of electrons but a different number of protons.

• Atoms with the same number of protons but a different number of neutrons.

• Atoms with the same number of neutrons but a different number of protons

Which statement explains why isotopes of the same element has the same chemical properties ?

• They have different mass number

• They have different numbers of protons

• They have the same numbers of neutrons

• They have the same number of outer shell electrons

What are the number of protons, neutrons and electrons in this potassium isotopes ?

• 19 protons, 19 neutrons, 20 electrons

• 19 protons, 20 neutrons, 19 electrons

• 20 protons, 19 neutrons, 19 electrons

• 20 protons, 20 neutrons, 19 electrons

Which particles are isotopes of the same element ?

• W and X

• W and Y

• X and Y

• X and Z