Which element has the atomic number 1?
A) Helium
B) Hydrogen
C) Oxygen
D) Nitrogen
Which scientist is credited with creating the modern periodic table?
A) John Dalton
B) Niels Bohr
C) Dmitri Mendeleev
D) Marie Curie
What is the most electronegative element?
A) Oxygen
B) Fluorine
C) Chlorine
D) Nitrogen
Which group of elements is known as the noble gases?
A) Group 1
B) Group 7
C) Group 18
D) Group 3
What type of bond forms between two nonmetal atoms?
A) Ionic
B) Covalent
C) Metallic
D) Hydrogen
Which of the following elements is a halogen?
A) Neon
B) Fluorine
C) Sodium
D) Magnesium
What charge do alkali metals typically have in compounds?
A) +1
B) +2
C) -1
D) -2
Which element is found in Group 2 of the periodic table?
A) Sodium
B) Magnesium
C) Carbon
D) Fluorine
Which type of bond involves the transfer of electrons?
A) Covalent
B) Metallic
C) Ionic
D) Hydrogen
What is the lightest noble gas?
A) Neon
B) Helium
C) Argon
D) Krypton
Which block of the periodic table contains transition metals?
A) s-block
B) p-block
C) d-block
D) f-block
Which bond is the weakest?
A) Covalent bond
B) Ionic bond
C) Hydrogen bond
D) Metallic bond
Which element has the highest atomic number in the periodic table?
A) Uranium
B) Oxygen
C) Oganesson
D) Francium
What do elements in the same group of the periodic table have in common?
A) Same number of neutrons
B) Same number of valence electrons
C) Same atomic mass
D) Same density
What is the main characteristic of metals?
A) Brittle
B) Poor conductors of electricity
C) Malleable and ductile
D) Low density
Which of the following is a property of ionic compounds?
A) Low melting points
B) High electrical conductivity in solid state
C) High solubility in water
D) Weak intermolecular forces
What is the charge of an electron?
A) +1
B) 0
C) -1
D) +2
Which of the following is an example of a covalent compound?
A) NaCl
B) H₂O
C) MgO
D) CaCl₂
Which metal is liquid at room temperature?
A) Sodium
B) Mercury
C) Iron
D) Aluminum
What type of bond holds together metal atoms?
A) Covalent
B) Ionic
C) Hydrogen
D) Metallic
Which family of elements is highly reactive with water?
A) Noble gases
B) Halogens
C) Alkali metals
D) Transition metals
Which of the following elements is a metalloid?
A) Silicon
B) Oxygen
C) Sodium
D) Krypton
What is the maximum number of electrons that can fit in the first shell of an atom?
A) 2
B) 4
C) 8
D) 10
Which element is most commonly used in semiconductors?
A) Iron
B) Silicon
C) Gold
D) Carbon
What type of bond forms between hydrogen and oxygen in a water molecule?
A) Ionic
B) Covalent
C) Metallic
D) Hydrogen
Which of the following is NOT a property of nonmetals?
A) Poor conductors of heat
B) Brittle in solid form
C) Dull appearance
D) High electrical conductivity
Which periodic trend increases from left to right across a period?
A) Atomic radius
B) Electronegativity
C) Metallic character
D) Ionic size
Which scientist proposed the octet rule?
A) Lewis
B) Dalton
C) Bohr
D) Rutherford
Which type of bond is responsible for holding DNA strands together?
A) Covalent bond
B) Ionic bond
C) Hydrogen bond
D) Metallic bond
Which noble gas is commonly used in balloons?
A) Neon
B) Helium
C) Xenon
D) Argon
