ㄑ = q
ㄑ is an initial: the consonant at the start of a syllable. In pinyin it is written q. It is aspirated: it has a strong puff of air.
Pinyin qIPA /tɕʰ/Initial · Palatals1 strokeName ㄑㄧ

How to say it
Like ㄐ with a strong puff of air, close to ch in “cheap”. Pairs only with ㄧ and ㄩ.
Do not mix up
ㄑ keeps the tongue flat and only pairs with ㄧ or ㄩ. ㄔ curls the tongue back. See ㄔ (ch) →
Stroke order, step by step
Stroke order from Taiwan’s Ministry of Education. The dot shows where the new stroke starts.
Words with ㄑ
去
ㄑㄩˋ
qù · go; leave · TOCFL Novice 1
氣
ㄑㄧˋ
qì · air; gas
七
ㄑㄧ
qī · seven · TOCFL Novice 1
千
ㄑㄧㄢ
qiān · thousand; a large but unspecified number · TOCFL Novice 1
以前
ㄧˇ ㄑㄧㄢˊ
yǐ qián · before; formerly · TOCFL Novice 1
請問
ㄑㄧㄥˇ ㄨㄣˋ
qǐng wèn · Excuse me; May I ask · TOCFL Novice 1
13 syllables with ㄑ
Make ㄑ glow.
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