Matter, Elements, and Compounds Flashcards
7 cards from real BECE practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Matter, Elements, and Compounds flashcards as text
What is the chemical symbol for gold?
Answer: Au
Gold's symbol Au comes from the Latin word 'Aurum.'
Atoms of the same element that have different numbers of neutrons are called:
Answer: Isotopes
Isotopes are atoms of the same element with the same proton count but different numbers of neutrons.
Elements in the same period (horizontal row) of the periodic table have the same:
Answer: Number of electron shells
Elements in the same period have the same number of occupied electron energy levels (shells).
Which of the following elements is a noble gas?
Answer: Argon
Argon (Ar) is a Group 18 noble gas with a complete outer electron shell, making it chemically inert.
The atomic number of an element equals the number of:
Answer: Protons in its nucleus
The atomic number is defined as the number of protons in the nucleus, which uniquely identifies each element.
Which of the following elements is classified as a metalloid (semimetal)?
Answer: Silicon
Silicon (Si) has properties of both metals and nonmetals, making it a metalloid widely used as a semiconductor.
The valency of an element refers to:
Answer: Its combining capacity when forming chemical bonds
Valency is the number of electrons an atom can gain, lose, or share when forming chemical bonds.