atomic structure (chem o lvl)

Which of the following statements is true for all atoms

• number of protons = numbers of electrons

• number of protons = number of neutrons

• number of neutrons = number of electrons

• number of neutrons = number of protons + electrons

Which of the following lists particles that have equal and opposite charges

• a proton and a neutron

• a neutron and an electron

• a neutron and a hydrogen nucleus

• a proton and an electron

Which statement about ²⁄₁H and ¹⁄₁H is true?

• Both have one neutron and one proton

• Both have only protons but no neutrons

• ²⁄₁H has two neutrons but ¹⁄₁H has one neutron

• ²⁄₁H has one neutron but ¹⁄₁H has no neutrons

Which one of the following shows the number of protons, neutrons and electrons present in an atom of sodium ²³⁄₁₁Na?

• A

• B

• C

• D

An atom of one isotope of phosphorus has 15 protons and 16 neutrons.

Which of the following describes a possible isotope?

• A

• B

• C

• D

Fill in the blanks:

Isotopes have the same _______ properties but slightly different physical properties

An atom of element X has the symbol ⁷⁄₃X. Which statement about element X is correct?

• In one atom, the number of protons + the numbers of neutrons is 10

• In one atom, the number of protons + the numbers of electrons is 6

• It is in Group III of the Periodic Table

• It is in Group VII of the Periodic Table

The diagram shows the structure of an atom. Which diagram shows the structure of an isotope of this atom?

• 
• 
• 
• 

What is the name given to atoms of the same element which have different masses?

Two gallium atoms are represented as follows:

(i) ⁶⁹⁄₃₁Ga

and

(ii) ⁷¹⁄₃₁Ga.

• Atom (i): 37 Atom (ii): 41

• Atom (i): 36 Atom (ii): 44

• Atom (i): 38 Atom (ii): 40

• Atom (i): 39 Atom (ii): 42