#1
Which of the following is a noble gas?
Helium
ExplanationHelium is classified as a noble gas.
#2
Which element is known for its high reactivity and is found in Group 1 of the periodic table?
Sodium
ExplanationSodium, found in Group 1, is known for its high reactivity.
#3
What is the atomic number of carbon?
6
ExplanationThe atomic number of carbon is 6.
#4
Which of the following elements is a halogen?
Fluorine
ExplanationFluorine is classified as a halogen.
#5
Which element is a noble gas and is commonly used in balloons for lifting?
Helium
ExplanationHelium, a noble gas, is commonly used in balloons for lifting.
#6
What is the chemical symbol for gold?
Au
ExplanationThe chemical symbol for gold is 'Au'.
#7
How many electrons does a neutral oxygen atom have?
8
ExplanationA neutral oxygen atom has 8 electrons.
#8
What type of bond is formed between two nonmetals by sharing electrons?
Covalent bond
ExplanationA covalent bond is formed between two nonmetals by sharing electrons.
#9
Which element is the most abundant in the Earth's crust?
Silicon
ExplanationSilicon is the most abundant element in the Earth's crust.
#10
In a chemical equation, what does the arrow represent?
Reaction
ExplanationThe arrow in a chemical equation represents a reaction.
#11
What is the name of the process where a substance changes from a gas to a liquid?
Condensation
ExplanationCondensation is the process where a substance changes from a gas to a liquid.
#12
How many valence electrons does a chlorine atom have?
7
ExplanationA chlorine atom has 7 valence electrons.